Which one is true about the following function?

def exam$\_$function $($a$,$b$,$ c$="$cng$111")$ :

print $(a,b,c)$

exam$\_$function$(1,2,"$cng$111$ final exam"$)$

a$.$ error! In the function call, strings should be sent to a and $b$ not integers $(1,2)$

b$.$ error! c cannot be assigned to a string in the parameter list

c$.$ error! c has string $"$cng$111",$ so we cannot send another string to $c$ in the function call

d$.$ a gets the value of $1,b$ gets the value of $2.$ c is overwritten and it gets string $"$cng$111$ final exam"