What is the output?

class Factorial:

def $($self$,$ num$1=5)$:

self.num$1=$ num$1$

def calculate$\_$fact$($self$)$:

fact $=1$

for $i$ in range $(1,$ self.num$1+1)$:

fact $**=i$

print $($fact$)$

fact $1=$ Factorial $(2)$

fact$1.$calculate$\_$fact$()$

a$.2$

b$.5$

c$.120$

d$.1$