An organization runs a highly available application across multiple VPCs and two on-premises data centers. All VPCs are in the same AWS Region and must be able to exchange large file transfers (multiple gigabytes) with each other and with the on-premises data centers. You must design an AWS Direct Connect solution that connects the on-premises data centers to each VPC while minimizing operational overhead. Which architecture satisfies the requirements with the least operational effort?

The correct option uses a Transit Gateway, which simplifies network architecture by centralizing connectivity between multiple VPCs and on-premises networks. Associating the Direct Connect gateway with the Transit Gateway allows all attached VPCs to communicate with on-premises resources over a single connection, minimizing operational overhead compared to individual VIFs per VPC. Using a transit VIF is specifically designed for Transit Gateway connectivity. An MTU of 8500 is the maximum supported for a transit VIF on a Direct Connect connection, optimizing large file transfers. Route propagation ensures dynamic routing updates. Incorrect options involving private VIFs per VPC or VPC peering for inter-VPC communication would significantly increase operational complexity and management overhead as the number of VPCs grows. The MTU of 9001 is not supported for Direct Connect transit VIFs.