Group Activity Processing 2-dimensional Arrays (60minutes) In groups of 2 or 3, write a C program the creates and initialises a 2D array with 4 rows and 4 columns. This array can be initialised with any values you choose. The program should then calculate the sum of all elements on the diagonal of the array. For example if the following array is created 1234 5 6 7 8 8765 43 21 Then you program should calculate the sum of the highlighted diagonal elements and provide an answer of 14 Now write another program which calculates the sum of the opposite diagonal 1234 5678 8765 4321 yielding (in this example), 22. Note that you do NOT have to make this code into a function. Also, it should be general enough to work with any square array