A port in a fibre channel switch failed, causing a costly downtime on the company's primary website. Which of the following is the MOST likely cause of the downtime?

iSCSI uses a different storage protocol stack over TCP/IP rather than Fibre Channel, which relies on HBAs and an FC fabric; an iSCSI initiator failure is irrelevant in an FC-based SAN environment.

Multipathing (MPIO) establishes multiple independent physical paths between a host HBA and SAN storage across a Fibre Channel fabric; when one switch port fails, the multipath driver automatically reroutes I/O over a surviving path with no service interruption. Without multipathing configured, the single Fibre Channel path is a single point of failure, and any port failure immediately severs storage connectivity and brings down dependent services such as the web server.

SAN snapshots are point-in-time data copies used for backup and recovery operations, not mechanisms for maintaining live storage connectivity during a switch port failure.

SAN replication to a backup site is a disaster recovery mechanism for off-site data protection and does not prevent or mitigate downtime caused by a local Fibre Channel switch port failure.