Assuming the following class is concurrently accessed by numerous threads, which statement about the CountSheep class is correct? 

A. The class is thread-safe only if increment1() is removed.

B. The class is thread-safe only if increment2() is removed.

C. The class is thread-safe only if increment3() is removed.

D. The class is already thread-safe.

E. The class does not compile.

F. The class compiles but may throw an exception at runtime.

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package fence; import java.util.concurrent.atomic. *; public class CountSheep { private static Atomic Integer counter = new Atomic Integer (); private object lock = new Object (); public synchronized int increment1() { return counter.incrementAndGet (); } public static synchronized int increment2() { return counter.getAndIncrement (); } public int increment3() { synchronized (lock) { return counter.getAndIncrement (); } } }