Function calc$\_$sum$()$ was copied and modified to form the new function calc$\_$product$().$ Which line of the new function contains an error?

def calc$\_$sum $(a,b)$ :

$s=a+b$

return s

def calc$\_$product $(a,b)$ : # Line $1$

$p=a*$b #Line $2$

return $s,$ #ine $3$

a$.$ Line $1$

b$.$ Line $2$

c$.$ Line $3$

d$.$ None of the lines contains an error