How is redundancy typically accomplished on SAN links in a UCS implementation?

A.
Redundant IOM modules

B.
Primary and backup VSANs

C.
Host multipathing software

D.
Primary and backup fabric interconnects

Explanation:
According to the DCUCD training material, page 2-88:

Within the Cisco UCS, SAN-level fabric failover is not available. This the traditional SAN host-based multipathing must be used to achieve that level of high availability