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Option C is correct: The Contractor is obligated to rectify any non-compliance with prevailing standards promptly.

Option D is correct: The Contractor carries responsibility for design fitness and correctness, even if the Engineer has approved or not objected to the design.

Option A is incorrect; Engineer approval does not absolve the Contractor from responsibility for defective design or works.

Option B is not necessarily required; only non-compliant parts need correction, not entire varied works.

The key issue in this question is the allocation of design responsibility and the treatment of unforeseeable physical conditions (particularly relevant for underground works or inaccessible areas).

The Yellow Book 2017 is specifically designed for projects where the Contractor is responsible for both design and execution, while still maintaining a balanced risk allocation. Importantly, Sub-Clause 4.12 [Unforeseeable Physical Conditions] allows the Contractor to claim additional time and/or cost for conditions that could not reasonably have been foreseen. Therefore, for projects involving underground or uninspectable works, the Yellow Book is highly appropriate. Hence, Option A is correct.

The Silver Book 2017 (EPC/Turnkey) also places full responsibility for design and execution on the Contractor. However, it adopts a much stricter risk allocation: the Contractor generally bears the risk of unforeseen physical conditions. This makes it less suitable for projects with significant uncertainty—unless amendments are made. By modifying Sub-Clause 4.12 in the Particular Conditions to reallocate risk (e.g., allowing relief for unforeseeable conditions), the Silver Book can be adapted for such projects. Therefore, Option C is correct.

Option B (Red Book) is incorrect because design responsibility primarily lies with the Employer, not the Contractor.

Option D is incorrect because using the Silver Book without amendment would place excessive and potentially unmanageable risk on the Contractor in cases involving unknown subsurface conditions.

This reflects a core FIDIC principle: selecting the appropriate form depends heavily on risk allocation and the degree of uncertainty in site conditions.

Two-stage procurement, involving pre-qualification followed by tender, is typically recommended for large-scale projects where many potential contractors might be interested. This process helps to shortlist qualified contractors, thus streamlining the tender evaluation and increasing the quality and competitiveness of submitted offers.

Option C correctly reflects this approach for complex or large projects where competition needs to be managed.

Option A is incorrect since simple, short-duration projects usually do not require complex procurement.

Option B is incorrect because if only a few capable contractors exist, pre-qualification may be less necessary.

Option D is incorrect as international financing does not always mandate two-stage procurement, although it often influences procurement methods.

Under the FIDIC Red Book 1999, the Performance Certificate marks the end of the Contractor’s obligations under the contract (Sub-Clause 11.9). The Engineer must issue this certificate once the Defects Notification Period has ended, all Contractor ' s Documents are submitted, and all works including defect rectification have been completed and tested.

Option C is correct because the Engineer is required to issue the Performance Certificate within 28 days after these conditions are met.

Option D is correct as the certificate is conditional upon fulfilling specific contract requirements (e.g., completion of works, submission of documents).

Option A is incorrect because acceptance of works usually happens earlier (e.g., taking-over certificate); the Performance Certificate represents completion of all contractual obligations, not just acceptance.

Option B is incorrect as the Performance Certificate confirms contractual completion but does not necessarily imply full mutual performance beyond contract terms.