Multiple choice The cmd: COPY A.TXT+B.TXT+C.TXT NEW.TXT ____________. will copy contents of all the three files into NEW.TXT is an invalid command contents of C.TXT will be copied into NEW.TXT none of these Reveal answer Fill a bubble to check yourself A Correct answer Explanation When we make three file in DOS shell and use copy command to copy the contents of all the three files into destination file. Here destination file is NEW.txt.Then we use this syntax which is absolutely right.