Which configuration will ensure continued connectivity between sites MOST securely?

Explanations:

A VPN connection can provide secure connectivity, but a cached storage gateway is primarily for local data access and does not facilitate direct application connectivity. This option does not fully address the requirement for secure and reliable connectivity.

AWS Snowball Edge is a physical data transfer device used for large data migrations, but it does not provide a continuous connectivity solution. It is not suitable for ongoing secure communication between the on-premises application and AWS applications.

Using a VPN Gateway over AWS Direct Connect combines the secure, private connectivity of Direct Connect with the encryption of a VPN, ensuring secure communication while also providing a stable connection even with unpredictable internet performance.

AWS Direct Connect offers a dedicated network connection to AWS but does not provide encryption by itself. For secure communication of confidential information, a VPN would still be necessary, making this option insufficient on its own.