Which option is a common cause of congestion found in a campus network?

Input serialization delay is the time to place bits on a link and is a concern on low-speed WAN links, not a primary congestion cause in high-speed campus switching environments.

Output serialization delay is similarly negligible on campus Gigabit or 10G links and is not a common campus congestion cause.

Rx-queue (receive queue) starvation is not a standard campus networking term for congestion - congestion is fundamentally an output phenomenon where transmit queues overflow.

In a campus environment, congestion almost always occurs at the output interface where the transmit queue fills faster than the scheduler can drain it, causing tail-drop or WRED drops. Tx-queue starvation results from speed mismatches (e.g., aggregating multiple fast uplinks to a single slower link) or traffic bursts exceeding output bandwidth, which is the typical campus congestion scenario.