We learnt about reliable data transfer (rdt) mechanisms in textbook Ch. 3, i.e., checksums, ACKs, timers, and sequence numbers. Consider a sender and receiver that are connected by an imperfect sender-to-receiver channel that can both corrupt and lose packets. But the return channel, i.e., receiver-to-sender channel, is perfect, i.e., it will not lose or corrupt packets. The delay on each channel is known to always be less than some maximum value, d. Neither channel will reorder packets. You are to design a rdt protocol for this network scenario. Explain why your rdt protocol requires checksums, ACKs, and timers? Explain how your protocol uses these rdt mechanisms? Explain why your protocol does NOT require sequence #? What is the timer value?