While working with MS-DOS, which command is used to combine FILE1 plus FILE2 into new file named FILE3? A. COPY FILE3 FILE1+FILE2 B. COPY FILE1+FILE2 FILE3 C. COPY FILE1+FILE2+FILE3 D. COPY FILE2 FILE1+FILE3 E. None of the above

The correct answer is: B. COPY FILE1+FILE2 FILE3

The COPY command is used to copy files from one location to another. The syntax for the COPY command is:

COPY source destination

The source is the file that

Option A is incorrect because it does not specify the destination file. Option C is incorrect because it tries to copy the contents of FILE1+FILE2+FILE3 into a new file named FILE3. This is not possible because FILE3 already exists. Option D is incorrect because it tries to copy the contents of FILE2 into a new file named FILE1+FILE3. This is not possible because FILE1+FILE3 does not exist. Option E is incorrect because it is not a valid command.