Two neighboring nodes $($A and B$)$ use a sliding window protocol with a $3-$bit sequence number. These nodes use a Go Back N floating window with a window width of $4$ to communicate.

$($sliding window$)$ runs the protocol. Node A is transmission and node B is

If you assume that it is receiving, draw the window positions if the following events occur successively:

$($a$)$ Before sending it to any frame

$($b$)$ Confirmation after node A sends frames $0,1,2$ and node B sends frames $0,1$

$($ack$)$ after receiving the message

$($c$)$ After node A sends frames $3,4$ and $5$ and node B receives confirmation for frame $4$

$($ack$)$ after receiving the message