Consider an Old Fashioned Telephone Booth That Can Be Occupied

Multiple Choice

Consider an old fashioned telephone booth that can be occupied by one person at a time.Suppose one person went in and dialed a part of her number, and had to leave the booth.A second person went in and dialed a part of his number, and before the number was fully dialed, a connection to some other phone was made.What Java threads analogy would prevent this undesirable scenario?
i.Acquire the lock prior to entering the booth
II.Dial a complete number when inside the booth
III.Hang up the phone and release the lock upon exiting the booth

A) Only I
B) I and II
C) I and III
D) I, II, and III