A multi-national retail company has built a hub-and-spoke network with AWS Transit Gateway. VPCs have been provisioned into multiple AWS accounts to facilitate network isolation and to enable delegated network administration. The organization is looking at a cost-effective, quick and secure way of maintaining this distributed architecture so that it provides access to services required by workloads in each of the VPCs. As a Solutions Architect Professional, which of the following options would you recommend for the given use-case?