A company runs multi-site hybrid infrastructure across the US and UK, with resources in us-east-1 and eu-west-2. Each Region uses a transit gateway to connect 15 VPCs. The company configured a transit gateway peering connection between Regions. Data centers are connected by a private WAN and exchange IP routes via iBGP. Each data center has a Direct Connect connection that terminates on a Direct Connect gateway and associates a transit VIF to the local transit gateway. Traffic normally follows the geographically shortest path, and cross-Region transfers should use the private WAN to reduce AWS costs. The transit gateway associations on the Direct Connect gateway currently advertise only local Region VPC prefixes. Routes to the other Region are learned via BGP from the other data center in original, non-aggregated form. Recently cross-Region transfers failed because of WAN issues. Modify routing so such interruptions do not cause outages, while preserving the original traffic routing goals when the network is healthy. Which changes should the engineer make? (Choose two.)