What is the result of this code?

while myNum $>0$:

 myNum $=$ myNum $-1$

 print$($myNum$)$

print$("$Blastoff$")$

a$.)$

Blastoff

b$.)$

An error because myNum has not been defined.

c$.)$

myNum $=0$

d$.)$

$0$