decimal a $=2\mathrm{.}5$m;

decimal b $=4\mathrm{.}0$m;

decimal c $=12\mathrm{.}7$m;

int i $=4$;

int j $=8$;

int k $=17$;

$($Refer to code example $4-1.)$ What is the value of x after the following statement is executed?

decimal x $=$ Math.Round$($c$)$

Question $17$ options:

a$)$

$12$

b$)$

$12\mathrm{.}7$

c$)$

$0$

d$)$

$13$