The correct answer is A. 02.
The SLR (Sleeper Luggage Rake) is a type of passenger train coach that is used to carry both passengers and luggage. It is typically the last coach in a passenger train. The maximum number of SLR coaches that can be attached in the rear of a passenger train is 2. This is because the SLR coach is the heaviest coach in a passenger train, and if too many SLR coaches are attached, the train may become too heavy and difficult to control.
Option B is incorrect because it is the maximum number of SLR coaches that can be attached in the front of a passenger train. Option C is incorrect because it is the maximum number of general coaches that can be attached in the rear of a passenger train. Option D is incorrect because it is the maximum number of coaches that can be attached in the rear of a passenger train.