When you define the everyday average function: int bar( const int& a, int b, int *c); can this function ever be marked const? Select one: O a. None of the choices listed below are correct about function bar O b. Not enough information has been supplied to answer this question one way or the other O c. No, it can never be marked const O d. Yes, it can be marked const depending on what the function does O e. Yes, it can always be marked const