Consider the GBN protocol with a sender window size of 4 and a sequence number range of 512. Suppose that at time t, the next in-order packet that the receiver is expecting has a sequence number of k. Assume that the medium does not reorder messages. Answer the following questions - a. What are the possible sets of sequence numbers inside the sender’s window at time t? Justify your answer. b. What are the possible values of the ACK field in all possible messages currently propagating back to the sender at time t? Justify your answer.

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only #2 represents an object at rest on a table.

in #1, there is no normal force due to the table; the object is accelerating downward.

in #3, the vertical forces are not balanced; the object is accelerating downward.

in #4, neither the vertical nor the horizontal forces are balanced. the object is accelerating upwards and to the right.