You are writing a method that returns an ArrayList named al. You need to ensure that changes to the ArrayList are performed in a thread-safe manner. Which code segment should you use?

You are writing a method that returns an ArrayList named al. You need to ensure that changes to
the ArrayList are performed in a thread-safe manner. Which code segment should you use?


A. ArrayList^ al = gcnew ArrayList();lock (al->SyncRoot){
    return al;}
B. ArrayList^ al = gcnew ArrayList();lock (al->SyncRoot.GetType()){
    return al;}
C. ArrayList^ al = gcnew ArrayList();Monitor::Enter(al);Monitor::Exit(al);return al;
D. ArrayList^ al = gcnew ArrayList();ArrayList^ sync_al = ArrayList::Synchronized(al);return   
    sync_al;


Answer: D