Which of the following statements regarding QoS packet loss are false?

Which of the following statements regarding QoS packet loss are false?
A . When a router receives data packets, packet loss may occur because the CPU is busy and cannot process data packets.
B . When data packets are scheduled to queues, packet loss may occur because the queue is full.
C . When data packets are transmitted on a link, packet loss may occur because of link faults.
D . Packet loss is generally caused by the delay, the tail drop packet loss may occur because of the queue is full.

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Answer: D