An organization is having a VPC for the HR department, and another VPC for the Admin
department. The HR department requires access to all the instances running in the Admin VPC
while the Admin department requires access to all the resources in the HR department. How can
the organization setup this scenario?

A.
Setup VPC peering between the VPCs of Admin and HR.

B.
Setup ACL with both VPCs which will allow traffic from the CIDR of the other VPC.

C.
Setup the security group with each VPC which allows traffic from the CIDR of another VPC.

D.
It is not possible to connect resources of one VPC from another VPC.

Explanation:
A Virtual Private Cloud (VPC) is a virtual network dedicated to the user’s AWS account. It enables
the user to launch AWS resources into a virtual network that the user has defined.
A VPC peering connection allows the user to route traffic between the peer VPCs using private IP
addresses as if they are a part of the same network.
This is helpful when one VPC from the same or different AWS account wants to connect with
resources of the other VPC.
http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/vpc-peering.html