What is this officer indicating?

What is this officer indicating?
A)Stop for all users approaching from the front.
B)Stop for vehicles approaching the officer from the front.
C)Stop for all users approaching the officer.Correct
It compels all road users approaching the officer to stop, except drivers who cannot do so safely.
The stop must be made at the nearest stop line or, failing that, immediately before the officer.
At an intersection, the stop must be made before entering it.
After this signal, the officer may, where appropriate, indicate the place where the stop must be made.

If the officer has one or both arms extended horizontally: (Image 1)
It compels users approaching the officer from any direction crossing that indicated by the extended arm or arms to stop, whatever their direction of travel, and remains in force even if the officer lowers the arm or arms, as long as he does not change position or make another signal.

If he moves the extended arm alternately up and down: (Image 2)
It compels drivers approaching the officer from the side corresponding to the arm making the signal and perpendicular to that arm to slow down.

Not to be confused with the swinging of a red or amber light, which compels road users towards whom the officer directs the light to stop. (Image 3)