This is more playing with words than a good question.

With modern engines there are various ways to control surge, one of them is the use of blow off valves (also called compressor bleed valves).

Engines with electronic fuel control systems (all modern jet engines) the valves are controlled by the fuel control unit, so we suppose that is the correct answer that the CAA want.

The end result will be that the blow off valve will reduce the pressure in the compressor to prevent the surge.