Refer to figure.
As we can see from the bottom left corner, all arriving and departing aircraft have an altitude restriction which prohibits them from going above 2000 ft. This rules out all answers except "Do not fly above 2000 ft and follow the railway with it on your left." which is the correct answer.

At the entry/exit point Inverurie Lane, there is a railway track denoted by a line which is alternating black and white in colour. There are 2 routes on either side of the railway track. On the southern side of the railway track, there is a route towards EGDP, indicated by the arrows and a solid line. This is the route we are looking for and when following it, the railway track would be on your left.

The route on the northern side of the railway track is going towards Inverurie Lane and away from EGDP. It is also indicated by arrows and by a dashed line.