Does the TCP finite state machine $($FSM$)$ help us detect illegitimate TCP state sequences? a$.)$ Yes, because, if the derived state sequence conforms to TCP FSM$,$ it is illegitimate. b$.)$ No$,$ because it is irrelevant. c$.)$ Yes, because it gives us a map of the related TCP Header fields. d$.)$ Yes, because, if the derived state sequence doesn't conform to TCP FSM$,$ it is illegitimate.