Counting only assignment statements as operations, what is the exact number of operations executed by the following code fragment in terms of n$?$

x $=$ n;

while $($x $>0)\{$

z $=0$;

while $($z $<=6)$

z $=$ z $+2$;

x $=$ x $-1$;

$\}$

Question $5$Select one:

a$.$

$6$n$+1$

b$.$

n$2$

c$.$

$2(6$n$)$

d$.$

$6$n