What term describes portfolio delivery in the context of MoP?

How does portfolio management enable the most effective balance of organizational change and business as usual?

1. ensure change initiatives are agreed at the appropriate management level

2. prioritize change initiatives in line with strategic objectives

3. review change initiatives regularly in terms of progress, cost, risk, benefits and strategic contribution

4. cancel change initiatives if other initiatives appear with a better predicted return

Which is a 'key to success' of the stakeholder engagement practice?