Can you solve this question

1.Checksum (checksum)

2. ACK (confirmation message)

3. Timer

4. Sequence numbering

A sender and receiver are connected to each other by two unidirectional communication channels. The G-A (sender receiver) channel is capable of corrupting or losing packets passing through it, while the A-G (receiving sender) channel is perfect (no packet disruption and loss). In both channels, the delay is always less than a certain value of d. The order of the packets in the channels is also not disturbed (in-order transmission). Design a reliable data transfer protocol between sender and receiver in accordance with this given scenario. Use the necessary of the above 4 mechanisms in your protocol.

(a) Draw finite state machines (FSM) for the sender and receiver.

(b) The roles (purposes) of the above 4 mechanisms that you use in your protocol. and explain why reliable protocol cannot exist without them