Which output is generated when the following code is executed?

def sum$($x$,$y$)$

return $($x$+$y$)$

input

nFirst$=$int$($input$(\text{'}$Number : $\text{'}))$

nNext $=$int$($input$(\text{'}$Number : $\text{'}))$

#processing

nTotal$=$sum$($nFirst$,$nNext$)$

#output

print$($nTotal$)$

a$.$

syntax error

b$.$

Number : $12$

Number : $23$

Total : $35$

c$.$

First Number : $12$

Second Number : $23$

$35$

d$.$

Number : $12$

Number : $23$

$35$