A company consists of 50 plus AWS accounts. Each account has multiple VPCs with egress internet connectivity using NAT gateway per Availability Zone (AZ). A solution architect has been asked to redesign the network architecture that will reduce costs, and manage egress traffic, and the growing needs of new accounts.
Which solution meets the requirements?

Answer options:

A.Create an egress VPC for outbound internet traffic. Use VPC peering between AWS accounts` VPCs and connect to a set of redundant NAT gateway in the egress VPC.B.Create a Transit Gateway in one central AWS account that will work as a hub and spoke model to other accounts VPCs using VPC attachments. Setup an egress VPC for egress traffic with redundant Nat Gateways.
C.Create a central VPC for outbound internet traffic. Use AWS Private links between AWS accounts` VPCs to a redundant NAT gateway in the central VPC.D.Create a Transit Gateway in one central AWS account that will work as a hub and spoke model to other accounts VPCs using VPN attachments. Set up a Central VPC for egress traffic with redundant Nat Gateways.

Answer: B
This architecture shows AWS Transit Gateway to centralize outbound internet traffic from multiple VPCs using hub-and-spoke design.
Option A is incorrect because VPC peering doesn’t support transitive routing between Account A VPC to Account B VPC to egress the internet.
Option B is CORRECT because this design supports transitive routing and centralizing egress, which helps to reduce cost.
Option C is incorrect because AWS Private Link doesn’t provide NAT.
Option D is incorrect because the VPN attachment is more on VPN connectivity.
References:
https://aws.amazon.com/blogs/networking-and-content-delivery/creating-a-single-internet-exit-point-from-multiple-vpcs-using-aws-transit-gateway/