4. Consider a sequence space that uses 4 bits. (a) What is the maximum send window size for a Go Back N protocol? What is a send window size that might not work correctly? Give an example of the incorrect operation. (b)What is the maximum send window size for a Selective Repeat protocol if the receive window size is 5? Assuming the receive window size is 5, choose a send window size that might not work correctly, and give an example of incorrect operation