Not yet answered Marked out of $1\mathrm{.}00$

In the given figure, if the present state is $1000,$ what is the value of $[$Q$8$ Q$4$ Q$2$ Q$1]$ after $4$ clock cycles at CLK$?$

Logic $1$

a$.$ None of the given options

b$.$ Q$8$ Q$4$ Q$2$ Q$1=1111$

c$.Q8Q4Q2Q1=0000$

d$.$ Q$8$Q$4$Q$2$Q$1=xxxx$

e$.Q8Q4Q2Q1=1010$