Assume the declarations: void Combine(string, char, int, double&, int&); double Calculate(int.double.int); char ch; string str; int X.X double z; string ans; which calls are invalid, which calls will lose significant data and why? Valid Invalid Why ans = Combine('a', "hello", z, x, y); Combine (str, ch, 14, 15.3,5.4); Combine ("hi", 'b', z, x, 9); a. b. C. d. e. f. Combine(str.ch.x.z.y); if (Calculate(4,5.5,3) > 0) ans = "positive"; while(Combine(4,5.5,3) > 0)) cout < < "forever";