LAB ACTIVITY 15.1.1: Lab-AL Final Project CMPSC121 or CMPSC201 In.txt has 12 letters each letter is on a separate line in the file Final Project Requirements Write an encryption program using in.txt as 'input" You must write the code for the functions O dispArray, O readFile, O key, o encrypt, o decrypt, and o revArray. How to approach this program Test you program after each step 1. cin the filename and Read the file specified in the filename into an array. 2. for example: string fileName; cin >> fileName; infile.open(fileName); also (see lab 12.3) readFile(inFile, letters, SIZE); 0 0/100 1. Display the array (See lab 12.3) dispArray(letters,SIZE); 2. Determine offset key (see lab 13.9) Call the "key" function to determine the encryption offset key. The function will count the number of E's and A's in your "letters" Array and and add them together to create the value for "offsetKey" Return an integer to the variable "offsetKey" 3 Dienlay the offeetkov