Problem $16\mathrm{.}5g)$ Find final state $O_0{Q}_1{O}_2{O}_3$ of counter given below after three clock cycles. Assume that

initial states of $Q_0{Q}_1{O}_2{O}_3$ are $1111.$

$($A$)1000$

$($B$)0000$

$($C$)1010$

$($D$)1100$