A server with two HBAs is connected to two identical fabrics and configured as active-active, load balanced with automatic failover. Under normal conditions, traffic is moving across both fabrics equally. During a maintenance window to upgrade code on the switches, Fabric A is taken offline. This server reports all paths lost. The switch on Fabric B shows no light on the port connected to HBA B. Which of the following should be the FIRST step to troubleshoot the problem?

A.
Check HBA B on the server.

B.
Remove the server from production.

C.
Replace the cable on Fabric A.

D.
Replace the switch in Fabric B