A class Shape has the following three member attributes of type double: dime1, dime2, dime 3. Which of the following is a valid prototype for the function that is used to overload the += operator as a non- member function. The overloaded function should add a decimal value to the three attributes? Note: Incorrect answers will be penalized Select one or more: friend Shape operator+= (double friend Shape operator+=(const double, const Shape &); Shape operator+= (double); friend Shape operator+=(const Shape &, const double); Shape operator+(const double, const Shape &); Shape operator+= (const Shape &, const double); None of the answers is correct