I personally will not recommend any in the list other than number 3.
You can use 4 also as long as you don't try to identify the sound. The sound should just make contact and produce a sensation and pass away with equanimity in the mind (no liking, disliking or developing self awareness). You should be very careful as not to have after thoughts or form perceptions which slip past your attention. This is generally very difficult for a novice. At a later stage you will start seeing sound as just quantums of vibrations. But having said this the best way to bring your mind to the present moment, if it has wondered away, is to listen to sound or look at the touch sensation as these are always in the present. In the case of sound, this should be done for a short duration due to reasons above.
What I would recommend is:
Before you start and end a session just look at the sensation of the touch of your clothes, wind and the ground and what your posture is.
Then start with breath meditation. To start with just try to see the in out breath. Then the start to finish of the breath. Then note the length of each in out breath from start to finish.
Once you can do that progress to other stages in the Anapanasati Sutta and Maha Sattipattana Sutta.