Batch files contain a group of MS-DOS commands that are run in successive order. What filename extension identifies batch files? A. COM B. BAT C. EXE D. SYS E. None of the above

The correct answer is B. BAT.

A batch file is a text file that contains a series of commands to be executed by the computer. Batch files are often used to automate tasks, such as starting programs, copying files, or deleting files.

The filename extension for batch files is .bat. This extension tells the operating system that the file is a batch file and should be executed by the command interpreter.

The other options are incorrect because they are not the filename extensions for batch files. COM files are executable files, EXE files are executable files, SYS files are system files, and E is not a valid filename extension.