How should the components be set up for this environment?

Configuring NetScaler high-availability pairs at each site provides redundancy and fault tolerance for secure remote access without requiring a complex cluster setup. Placing StoreFront servers and Delivery Controllers within the secure internal network aligns with best practices, as StoreFront does not require direct public exposure and Delivery Controllers are core infrastructure that should be protected behind the corporate firewall.

Configuring a NetScaler cluster at each site is typically for scaling throughput rather than providing simple high-availability pairs for the ICA proxy function, and can add unnecessary complexity for a multi-site setup.

Placing StoreFront servers in the DMZ is generally not a recommended security practice; StoreFront should reside in the internal network, protected by the corporate firewall, with only the Citrix Gateway in the DMZ.

This option combines the less suitable NetScaler cluster configuration with the problematic placement of StoreFront servers in the DMZ, which contradicts standard architectural guidelines for security and efficiency.