If a class has synchronized code, multiple threads can still access the nonsynchronized code.
[C].
Variables can be protected from concurrent access problems by marking them with the synchronized keyword.
[D].
When a thread sleeps, it releases its locks.
Answer: Option B
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.
