Question

In a sliding window protocol with a window size of 4, using Go-Back-N ARQ, if frame 3 (out of frames 0-7, using 3-bit sequence numbers) is lost during transmission but frames 4, 5, and 6 arrive successfully at the receiver, what does the receiver do?

A Buffers frames 4, 5, and 6 and requests retransmission of only frame 3
B Discards frames 4, 5, and 6 and the sender must retransmit frames 3, 4, 5, and 6 once it detects the loss
C Accepts all frames and reorders them locally
D Immediately terminates the connection
E Frames 4, 5, and 6 are acknowledged individually with no impact from frame 3's loss
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