【单选题】
Which statement is true about the components of a queuing mechanism？（）
A、Each subinterface has its own hardware queue and can experience congestion just like its main interface
B、Hardware queuing is only used if the software queues are experiencing congestion.
C、Hardware queues and software queues are not used concurrently.
D、The hardware queuing system always uses the FIFO queuing mechanism.
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