2. What are the three components of an abstract data type (ADT)? 3. Overload operator>> for the string class defined in problem 1. You can assume it is a friend function. Read in a string from a stream until a semicolon () is read. Blanks MUST be included into the string, but the end of line character or semicolon should NOT. You do not need to check for end of file. 4. Overload operator