Question: What role does a timer play in reliable data transfer protocols? Question 3 options: It compresses data to fit into packets. It calculates the checksum

What role does a timer play in reliable data transfer protocols?
Question 3 options:
It compresses data to fit into packets.
It calculates the checksum of packets.
It encrypts the data packets.
It assigns sequence numbers to packets.
It triggers retransmission of lost packets.

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