A program reads the data from a file called input_file.txt and, after doing some arithmetic calculations, writes the results to a file called output_file.txt. A. After the program executes, what are the contents of the file input_file.txt? B. After the program executes, what are the contents of the file output_file.txt if this file was empty before the program executed? C. After the program executes, what are the contents of the file output_file.txt if this file contained 50 numbers on sperate line, before the program executed? D. What would happen if the file output_file.txt did not exist before the program executed? E. What will be the streams need to use for the read input_file.txt and write the data to output_file.txt