What is a valid IPv6 addresss record in DNS?

Refer to the exhibit. Routers R1 and R2 have been configured with their respective LAN interfaces. The two circuits are operational and reachable across the WAN. Which command set establishes failover redundancy if the primary circuit goes down?
A network security team noticed that an increasing number of employees are becoming victims of phishing attacks. Which security program should be implemented to mitigate the problem?
Which interface is used to send traffic to the destination network?
10.249.210.56/25 [90/6144] via G0/15
10.249.210.56/25 [90/45053] via G0/13
10.249.210.56/25 [110/3693] via G0/16
10.249.210.56/25 [110/360] via G0/12