שאלה | What distinguishes GBN ARQ from SR ARQ in terms of retransmission upon a timeout?

What distinguishes GBN ARQ from SR ARQ in terms of retransmission upon a timeout?

		GBN ARQ retransmits only the lost packets, while SR ARQ retransmits all packets.
		GBN ARQ retransmits individual packets, while SR ARQ retransmits batches of packets.
		GBN ARQ retransmits all previously sent packets, while SR ARQ retransmits only the packets that are necessary.
		GBN ARQ retransmits packets in order, while SR ARQ retransmits packets selectively.