A coin is tossed thrice. Let X be the event that head occurs in each of the first two tosses. Let Y be the event that a tail occurs in the third toss. Let Z be the event that two tails occur in three tosses. Bases on the above information, which one of the following is TRUE?
(a) X and Y are not independent
(b) Y and Z are dependent
(c) Y and Z are independent
(d) X and Z are independent