Observe following function declaration and choose the best Ans:

int divide ( int a, int b = 2 )


A. Variable b is of integer  type and will always have value 2
B. Variable a and b are of int type and the initial value of both variables is 2
C. Variable b is international scope and will have value 2
D. Variable b will have value 2 if not specified when calling function

Ans: D