You have created 3 VPCs, VPC A, VPC B and VPC
C. There is a VPC peering connection between VPC A and VPC B and a separate peering connection between VPC B and VPC
C. Which of the following is true with regards to this VPC peering arrangement?

Answer options:

A.Instances launched in VPC A can reach instances in VPC
C.B.Instances launched in VPC A can reach instances in VPC C if the right routing entries are present.
C.Instances launched in VPC A can reach instances in VPC C if the right Security Groups rules are present for the instances.
D.Instances launched in VPC A can reach instances in VPC C via a proxy instance in VPC
B.

Answer – D
Since transitive peering is not allowed, you can use a proxy instance to forward the requests.
Options A, B and C are all invalid because, as per the AWS Documentation, this is the rule of transitive peering.
For more information on VPC peering configurations, please visit the below URL:
https://docs.aws.amazon.com/AmazonVPC/latest/PeeringGuide/invalid-peering-configurations.html