A queuing system is unstable ifQuestion $1$ options:Average$/$expected inter$-$arrival time a is smaller than the average$/$expected service time pThere is variability$/$uncertainty of service time and inter$-$arrival timeUtilization u is less than $100\%$Arrival rate is smaller than the total service rate $($or capacity$)$Average$/$expected inter$-$arrival time a is larger than the average$/$expected service time p