Amazon WorkSpaces and AWS Site-to-Site VPN are the correct choices for this scenario because WorkSpaces supplies centrally managed, persistent Windows desktops for remote employees and Site-to-Site VPN provides a secure IPsec tunnel from the AWS VPC to the on premises network so those desktops can reach internal applications.

Amazon WorkSpaces delivers full Windows desktop sessions that are managed from AWS and can be provisioned with persistent user volumes and group policies. This makes it suitable when users need a centralized Windows desktop experience rather than just streamed applications.

AWS Site-to-Site VPN creates an encrypted connection between the VPC and the corporate network so virtual desktops in AWS can access internal resources as if they were on the corporate LAN. The VPN option is appropriate when the requirement calls for secure connectivity without requiring dedicated physical circuits.

Amazon AppStream 2.0 is not correct because it streams individual applications rather than providing a full, persistent Windows desktop environment. It does not meet the managed desktop requirement in this scenario.

AWS Direct Connect is not the best choice for this use case because it provides a dedicated private network connection and does not include encryption by default. It is aimed at high throughput and low latency connections and is not targeted at providing secure tunnels for remote desktop sessions from individual users.

Amazon Connect is not relevant because it is a cloud contact center service and does not provide virtual desktop delivery or VPN connectivity to on premises resources.

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