You have 2 VPCs VPCA(172.16.0.0/16) and VPCB(10.0.0.0/16). You are planning to establish VPC connecting peering. Which of the following routes must be added to the route table for both VPCs to ensure communication across VPCs? Choose 2 answers from the options given below. Assume that the Target for the VPC Peering connection has an ID of pcx-1122.

Answer options:

A.In the Route table for VPCA, add a route of 172.16.0.0/16 and Target as pcx-1122.
B.In the Route table for VPCA, add a route of 10.0.0.0/16 and Target as pcx-1122.
C.In the Route table for VPCB, add a route of 172.16.0.0/16 and Target as pcx-1122.
D.In the Route table for VPCB, add a route of 10.0.0.0/16 and Target as pcx-1122.

Answer - B and C
An example is given on the AWS documentation on this as per the snapshots below. And this also gives the Route table configurations.
Options A and D are incorrect because the route entry is invalid.
For more information on this example, one can visit the below URL
http://docs.aws.amazon.com/AmazonVPC/latest/PeeringGuide/peering-configurations-full-access.html