Suppose cType is a class template, and func is a member function of cType. When writing the definition of func, its heading is:

$?$

a$.$ template

Suppose cType is a class template, and func is a member function of cType. When writing the definition of func, its heading is:

a$.$ template

Which of the following is the general syntax of the function prototype to overload the pre$-$increment operator $++$ as a member function?

a$.$ className operatort$+($int$)$;

b$.$ className operator $++()$ ;

c$.$ friend className operatort$+()$;

d$.$ friend className operatort$+($int$)$ ;