C language:

Please code this probelm (all stages). If it is clear, I will upvote for sure :)

Task: Write file appending program. It takes number of file names and appends all but the last file to the last one, order of the data in the last file must preserve the order of arguments. After the program call: ./append FileA FileB FileC FileD FileD should contain DDAABBCC You can only use AIO to access and modify files. You can use any number of buffers and blocks to make this program parallel as long as the total memory occupied by all buffers is no more than 2kB. You can not create a new file. Search for fastest solution. You cannot use fork or pthread_create in this task. Graded stages (please report the stage as soon as you finish it). 1. Use regular IO and limit the program to only two arguments 2. Use AIO and limit the program to only two arguments 3. Accept more than two arguments, files are processed in sequence 4. Files are processed in parallel where memory limit allows