Why is deploying two NetScaler appliances - one in the primary and one in the secondary datacenter, configured with GSLB, the best design solution?

GSLB (Global Server Load Balancing) intelligently directs end-user traffic to the optimal datacenter, which can be configured to prioritize the primary site while ensuring secure and reliable connectivity. This design provides high availability and disaster recovery capabilities across sites, ensuring continuous service and contributing to a secure and reliable user experience for accessing applications.

While GSLB certainly provides redundancy and can optimize WAN traffic by directing users to the closest or least loaded datacenter, option A offers a more encompassing end-user benefit and a key design goal of connecting users to their primary datacenter.

This option describes a functional segmentation of NetScaler features, which is not a direct benefit or primary purpose of configuring GSLB across two datacenters.

GSLB's primary role is datacenter selection for optimal access, not directly the expansion of remote access usage or providing SSL VPN functionality, although it can direct users to gateways that offer those features.