The following class keeps track of how much of a memory block (say. 512 bytes) is being used. It contains a pointer that will point to the first element of an array. This array will be of an arbitrary size. There is a second integer to hold the size (as given by the user at the time of instantiation). Each element of the array is a block, and the number kept in that element is the bytes of that block used. class BleckUsage private: int* blocks: int numBlocss public: // constructors (default, one arg, and copy.) // destructor // Member function ) If this is in the Class Specification file(lackUsageh), write the function definitions that would be in the Class Implementation file (BlockUsage.cpp). For the default constructor, NULL and 0 are appropriate default values. i) Why must the parameter of the copy constructor be of type constant reference