Maximum length of DOS command using any optional parameter is

The correct answer is: C. 127 characters

A DOS command is a line of text that tells the operating system what to do. The maximum length of a DOS command is 127 characters, including the space between the command and any parameters.

Option A is incorrect because the maximum length of a DOS command is 127 characters, not 26 characters.

Option B is incorrect because the maximum length of a DOS command is 127 characters, not 87 characters.

Option D is incorrect because the maximum length of a DOS command is 127 characters, not none of the above.