Account A and Account B are part of AWS Organizations. Subnets from non-default VPC in Account A need to be shared with Account
B. Sysops administrator is planning to enable this sharing using AWS RAM. Since this is a PoC (proof of concept), the security team has instructed not to enable sharing across all accounts within AWS Organizations. 
What should be done to enable subnet sharing between Account A and B?

Answer options:

A.Account A should share an invitation as an external principal to Account B; post-acceptance of invitation subnets can be shared with Account
B.B.Account B should be moved out of AWS Organizations post which VPC subnets of account A can be shared with Account
B.C.Account A should be moved out of AWS Organizations post which VPC subnets of account A can be shared with Account
B.D.Enable sharing on other AWS Organizations. Then Account B`s subnet resources can be shared with Account A.

Correct Answer: A
There are two options for sharing subnets between accounts that are part of AWS Organizations using AWS RAM.
Enable sharing within AWS Organizations
Share resources within individual accounts as external principals. For this, invitations should be sent for resource share, and post-acceptance subnets can be shared.
Option B is incorrect as removing Account B from AWS Organizations is not required to have subnet sharing between Account A and
B.Option C is incorrect as removing Account A from AWS Organizations is not required to have subnet sharing between Account A and
B.Option D is incorrect as sharing is enabled on other AWS Organizations. Resources can be only shared within accounts / OUs of AWS Organizations and Not with accounts within other AWS Organizations.
For more information on sharing VPC using AWS Resource Access Manager (RAM), refer to the following URL,
https://docs.aws.amazon.com/ram/latest/userguide/getting-started-sharing.html