A reflective marker that indicates the end of the usable tape is

End user
End-of-tape
Optical mark reader
FAX E. None of the above

The correct answer is B. End-of-tape.

An end-of-tape (EOT) marker is a reflective marker that indicates the end of the usable tape on a magnetic tape drive. It is used to prevent the drive from trying to read data from the blank portion of the tape, which could damage the drive or the tape.

The other options are incorrect.

  • End user is the person or organization that uses a product or service.
  • Optical mark reader is a device that reads marks made on paper or other materials.
  • FAX is a system for sending and receiving documents over telephone lines.
  • None of the above is not a valid option.