This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to rehab your knee after acl surgery 
Use a knee brace to stabilize your knee following surgery. 
In the hours following surgery, a knee brace will be place around your knee to support and stabilize it. This knee brace should be worn over the next 4 to 6 weeks, while your knee is at rest (i.e. it shouldn't be worn while you are performing rehabilitation exercises).

OPTIONS:
[1]. The brace should be made of linen or leather. Doctors recommend keeping the brace on for at least 4 weeks after surgery to maintain optimal healing.;
[2]. Follow the directions your doctor gives you to use a knee brace, including bathroom directions. Discuss the wear and tear of the knee brace with your family and friends.;
[3]. Massage and rearrange your knee during recovery to give it more structure and support. Massage and rearrange your knee should be done as needed throughout recovery and avoid pain.;
[4]. Make sure the brace is worn around the kneecap and that it is secured tightly. Keep your knee elevated to avoid swelling.;
The answer is:
[4].