The notifyAll() method must be called from a synchronized context.
[B].
To call wait(), an object must own the lock on the thread.
[C].
The notify() method is defined in class java.lang.Thread.
[D].
The notify() method causes a thread to immediately release its locks.
Answer: Option A
Explanation:
Option A is correct because the notifyAll() method (along with wait() and notify()) must always be called from within a synchronized context.
Option B is incorrect because to call wait(), the thread must own the lock on the object that wait() is being invoked on, not the other way around.
Option C is wrong because notify() is defined in java.lang.Object.
Option D is wrong because notify() will not cause a thread to release its locks. The thread can only release its locks by exiting the synchronized code.
