The following function is intended to compute the factorial of a number, N$.$ Which line

needs to replace the BLANK for the function to work correctly?

def fact$($N$)$:

if N $<=1$:

return $1$

else:

return BLANK

A$.$ N $*$ fact$($N$-1)$

B$.$ N $+$ fact$($N$-1)$

C$.$ fact$($N$)+$ fact$($N$)$

D$.$ N $*($N$-1)$

E$.$ N $+$ N$^2$