Which AWS service or feature can be used to establish this connection?
AWS Client VPN
VPC peering
AWS Direct Connect
VPC endpoints
Explanations:
AWS Client VPN is used to securely connect individual client devices to a VPC, not for connecting two VPCs across regions.
VPC Peering allows direct communication between two VPCs, and it supports connections across different regions (inter-region VPC peering).
AWS Direct Connect is used for dedicated network connections from an on-premises data center to AWS, not for VPC-to-VPC communication across regions.
VPC endpoints are used to privately connect to AWS services, not to establish connections between VPCs across regions.