The top most row of keys on the standard keyboard contains__________keys, and the longest key on the keyboard is ____________ ?

A. Alphabetic, space bar
B. Number, enter key
C. Function, enter key
D. Function, space bar

The function keys, also called the F-keys or Fn keys, are located in the top row of nearly all computer keyboards. They typically contain at least F1 through F12, but may include to F16 on some keyboards. The function that each key provides depends on what program is currently running, and certain keys may provide no function at all.