Which of the following is a valid syntax to synchronize the HashMap?

Question

Admin · Accepted Answer

Map m1 = Collections.synchronizedMap(hashMap);

Admin · Answer

HashMap map =hashMap.synchronizeMap();

Admin · Answer

Map m = hashMap.synchronizeMap();

Admin · Answer

Map m2 = Collection.synchronizeMap(hashMap);

Q. Which of the following is a valid syntax to synchronize the HashMap?