Which of following assists in setting a Active/Passive Direct Connect connection to AWS?

Answer options:

A.Use VPC Peering
B.Use a Virtual private gateway
C.Use Route Propagation
D.Use AS_PATH prepending

Answer – D
The AWS documentation mentions the following
Active/Passive (failover). One connection is handling traffic, and the other is on standby. If the active connection becomes unavailable, all traffic is routed through the passive connection. You will need to AS path prepend the routes on one of your links for it to be the passive link.
For more information on Active Passive Direct Connect , please refer to the below link:
https://aws.amazon.com/premiumsupport/knowledge-center/active-passive-direct-connect/