code example 18-2 template class mixedtype { private: t1 value1; t2 value2; public: mixedtype(t1 val1, t2 val2); t1 get value1() { return value1; } t2 get value2() { return value2; } mixedtype copy() { mixedtype get copy(value1, value2); return copy; } }; (refer to code example 18-2.) how would you define the constructor for this class, if you had to define it outside of the class declaration? group of answer choices template mixedtype::mixedtype(t1 val1, t2 val2) { value1