Which of the following expansion cards should be installed into a server to provide fiber channel SAN connectivity?

To provide Fiber Channel SAN (Storage Area Network) connectivity in a server, the appropriate expansion card to install is a Host Bus Adapter (HBA). An HBA is specifically designed to connect a server to a network storage system using Fiber Channel technologies. It enables communication between the server's host operating system and the storage devices within the SAN, facilitating high-speed data transfer and efficient storage management.

The HBA includes the necessary protocols and hardware interfaces to manage the transfer of data to and from the storage devices over the Fiber Channel network. This ensures that the server can access and utilize the storage resources effectively, making it critical for environments that require high availability and performance, such as databases and applications with high data throughput needs.

In contrast, the other options provided do not serve this purpose. USB (Universal Serial Bus) is mainly used for connecting peripheral devices like keyboards and mice, and it is not suitable for SAN connectivity. UAC (User Account Control) is a security feature in Windows operating systems and has no relevance to hardware connectivity. NIC (Network Interface Card) is used for Ethernet connections to networks but does not support Fiber Channel, which is a different protocol designed specifically for storage networking. Thus, the HBA is the correct choice for achieving Fiber Channel