Consider the code:

def f$($x$)$:

$\text{'}\text{'}\text{'}$ Pre: x is a natural number $\text{'}\text{'}\text{'}$

a $=$ x

y $=10$

while a $>0$:

a $=$ a $-$ y

y $=$ y $-1$

return a $*$ y

From the following select the correct answer.

Question $1$Answer

a$.$

This function has an incorrect precondition.

b$.$

This function always terminates.

c$.$

This function always returns a positive value.

d$.$

This function never terminates.