Which statement is correct about the number of available QoS system classes in FCoE?

While hard-set, this option implies *all* classes cannot be disabled, which is less specific and potentially inaccurate compared to identifying the specific mandatory classes.

The *number* of QoS system classes in FCoE is generally hard-set by the underlying hardware and standards, not configurable with an upper limit.

In FCoE, the QoS system classes are hard-set, meaning their number and some basic functions are fixed by the hardware and FCoE standards. The best-effort class for standard Ethernet traffic and the dedicated Fibre Channel class for FCoE traffic are mandatory and cannot be disabled to ensure network operation and lossless FCoE data delivery.

It is incorrect that all but one class can be disabled, as FCoE requires at least both a best-effort and a lossless Fibre Channel class to be active.

The *number* of QoS system classes in FCoE is typically fixed, not configurable with an upper limit of eight, although hardware often provides eight queues.