My laptop keyboard types numbers instead of letters!

An end-user is complaining that their laptop keyboard is displaying numbers when letter keys are pressed. When you look at the laptop, you confirm that pressing some of the letters on the keyboard shows numbers on the screen. What is the most likely cause of this problem?

A) The Windows operating system has remapped the keyboard layout

B) The Caps Lock key is enabled

C) The laptop’s secondary function key is in lock mode

D) The laptop’s keyboard is faulty