Which statement is true?

A static method cannot be synchronized.
If a class has synchronized code, multiple threads can still access the nonsynchronized code.
Variables can be protected from concurrent access problems by marking them with the synchronized keyword.
When a thread sleeps, it releases its locks.

Correct Answer: If a class has synchronized code, multiple threads can still access the nonsynchronized code.

Explanation:

B is correct because multiple threads are allowed to enter nonsynchronized code, even within a class that has some synchronized methods.

A is incorrect because static methods can be synchronized; they synchronize on the lock on the instance of class java.lang.Class that represents the class type.

C is incorrect because only methods—not variables—can be marked synchronized.

D is incorrect because a sleeping thread still maintains its locks.

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