A company is using IAM Organizations to develop a multi-account secure networking strategy.

Use IAM Control Tower. Modify the default Account Factory networking template to automatically associate new accounts with a centrally managed VPC through a VPC peering connection and to create a default route to the VPC peer in the default route table. Create an SCP that denies the CreatelnternetGateway action. Attach the SCP to all accounts except the security inspection account.

Create a centrally managed VPC in the security inspection account. Establish VPC peering connections between the security inspection account and other accounts. Instruct account owners to create default routes in their account route tables that point to the VPC peer. Create an SCP that denies theAttach InternetGateway action. Attach the SCP to all accounts except the security inspection account.

Use IAM Control Tower. Modify the default Account Factory networking template to automatically associate new accounts with a centrally managed transitgateway and to create a default route to the transit gateway in the default route table. Create an SCP that denies the AttachlnternetGateway action. Attach the SCP to all accounts except the security inspection account.

Enable IAM Resource Access Manager (IAM RAM) for IAM Organizations. Create a shared transit gateway, and make it available by using an IAM RAM resource share. Create an SCP that denies the CreatelnternetGateway action. Attach the SCP to all accounts except the security inspection account. Create routes in the route tables of all accounts that point to the shared transit gateway.