The correct answer is B. MSD (Microsoft System Diagnostics).
MSD is a DOS-based program that can be used to diagnose problems with your computer. It can display information about your hardware, including the serial ports that are detected.
To run MSD, type “msd” at the command prompt. You will be presented with a list of options. Select “Hardware” and then “Ports.” This will display a list of the serial ports that are detected on your computer.
A. comdiag is a program that can be used to configure serial ports. It is not used to detect serial ports.
B. MSD is a program that can be used to diagnose problems with your computer. It can display information about your hardware, including the serial ports that are detected.
C. command.com is the default command interpreter for DOS. It is not used to detect serial ports.
D. SDET is a program that can be used to test software. It is not used to detect serial ports.
E. serial.chk is a program that can be used to check the status of serial ports. It is not used to detect serial ports.