A: Autofocus; A1: Af-C Priority Selection; A2: Number Of Focus Points - Nikon D5200 Reference Manual

a: Autofocus

a1: AF-C Priority Selection

When AF-C is selected for viewfinder photography (0 33), this option controls
whether photographs can be taken whenever the shutter-release button is pressed
(release priority) or only when the camera is in focus (focus priority).
Option
G Release
F Focus

a2: Number of Focus Points

Choose the number of focus points available for manual focus-point selection.
Option
# 39 points Choose from the 39 focus points shown at right.
Choose from the 11 focus points shown at right. Use for
A 11 points
quick focus-point selection.
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Photos can be taken whenever the shutter-release button is pressed.
Photos can only be taken once the camera has focused.
G button A Custom Settings menu
Description
G button A Custom Settings menu
Description