What is the error within the following code segment? $$

$$while Num $>0$:

Num $=$ Num $-1$

print$($Num$)$

a$.)$

Num should be incremented instead of decremented.

b$.)$

Num has not been initialized.

c$.)$

Nothing is printed in the while loop.

d$.)$

The while expression should be evaluated with