Consider the following class declaration: class Thing { private: int x; int y; static int z; public: Thing() { x = y = z; } static void putThing(int a) { z = a; } }; int Thing:: z = 0: Assume a program containing the class declaration defines three Thing objects with the following statement: Thing one, two, three; A) How many separate instances of the x member exist? B) How many separate instances of the y member exist? C) How many separate instances of the z member exist? D) What value will be stored in the x and y members of each object?