Ex 1. File Class Implement Class file as described in the UML diagram above, Notice that: 1- print details and destructor are virtual. 2- merge (File) is pure function. 3- in print details function you must print your name and ID number only!. Ex 2. Excel Class Implement Class Excel as described in the UML diagram above. Notice that: 1- Parameterized constructor that receives all data members including data members in the base class. 2- In merge you must add the number of sheets in the receiving object to the current object. 3- in print you have to print all details of object. 4- override the destructor. Ex 3. Word class Implement Class Excel as described in the UML diagram above. Notice that: 1- Parameterized constructor that receives all data members including data members in the base class. 2- In merge you must add the number of pages in the receiving object. 3- in print you must print all details of object. 4- override the destructor. : 4. Driver Implement a driver program to test your code. 1- Create one object of type Word and another of type Excel. 2- Create array of pointers of type File of size 2 The first pointer points to the first object and the second pointer points to the second object. 3- Create array of pointers of type File of size 5, then ask the user to enter the type of file (Word or Excel) for each element of the array. 4- Merge any two objects of type Word then print the details. x 5. Friend function Implement the function bool find(Word\& doc, int pages) that searches in the pages in the received Word object for the received num of pages. Make this function a friend of class Word and modify your main() to test this function