Your production team had earlier created a VPC with the CIDR block of 192.168.0.0./16. Instances were launched in the VPC. Now there is a decision to ensure the instances have an address space for 10.0.0.0/16. How can this be achieved?

Answer options:

A.Add a new address space to the VPC. Then ensure that the instances use the new address space
B.Create a new VPC with the address block of 10.0.0.0/16. Create new instances in the new VPC.C.Change the address block of the VPC from 192.168.0.0./16 to 10.0.0.0/16. All of the instances will now use the new address space.
D.Launch a NAT Instance. Ensure that the instance performs Network address translation onto the CIDR range of 10.0.0.0/16

Answer – B
Since the initial CIDR block is 192.168.0.0./16 , the additional CIDR blocks should correspond to the similar ranges. The below snapshot shows when you try to add a different CIDR block to an existing VPC which is different from the main CIDR block. You will get an error.
Option A is invalid because of the above mentioned error
Option C is invalid because you can’t change the existing CIDR block
Option D is invalid because using a NAT instance is not the right approach
For more information on VPC and Subnet sizing , please visit the below URL
https://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Subnets.html#VPC_Sizing