A User Calls the Help Center Complaining That Her Laptop

Multiple Choice

A user calls the help center complaining that her laptop keyboard is malfunctioning, outputting numbers rather than letters for certain keys. What is the most likely problem?

A) The laptop's keyboard is internally damaged and needs to be replaced.
B) The laptop's inverter board is damaged and needs to be replaced.
C) The user has accidentally pressed the Num Lk key.
D) The user has accidentally pressed the Fn key.