Write a program where you take a 5 x 5 matrix as input from the user and determine if it is an identity matrix. A matrix is an identity matrix if it has ones along its main diagonal and zero everywhere else. Implement the following functions in your program and use them in the main function. // reads input values from the user and stores it in matrix m void inputMatrix(int m[][5]) // returns 1 if matrix m is identity matrix and 0 otherwise int isIdentity (int m[] [5]) Your answer Write a program where you open a file named "test.txt". If the file does not exist, the program should quit doing nothing (the file should not be created). Otherwise it adds the text File opened" at the end of the file. Your