Consider FIFO, Priority, Round Robin $($RR$),$ and Weighted Fair Queueing $($WFQ$)$ packet scheduling disciplines, which of these queueing disciplines ensure that all packets depart in the order in which they arrived?Question $7$Select one:a$.$none of these scheduling disciplines can ensure that all packets depart in the order in which they arrived.b$.$all these scheduling disciplines can ensure that all packets depart in the order in which they arrived.c$.$Only FIFO can ensure that all packets depart in the order in which they arrivedd.RR and FIFO can ensure that all packets depart in the order in which they arrived