Which of the following function headers is correct ?

A. def fun (a = 2, b = 3, c)

B. def fun(a = 2, b, c = 3)

C. def fun(a, b = 2, c = 3)

D. def fun(a, b, c = 3, d)

Correct Answer is :

C. def fun(a, b = 2, c = 3)