Red definitely. If possible use a 5.5mm drill. Make sure the plug is well into the wall - head at least half the thickness of the plaster(board) into the wall.
Well have drilled the wall. I suggested 5.5mm drill as the plug will fit into the hole tightly. With a 4.5mm screw you get a more secure fix with the plug in the fractionally smaller hole.
The head (top) of the plug needs to be under the surface of the plaster finish by at least half the thickness of the plaster(board) - that stops the plaster from cracking, makes for a more secure fixing as the plug and screw are in more brickwork and makes covering up when the screw is removed in the future easier to hide.
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