Let {o1, o2, o3, o4} represent the outcome of a random experiment, with P({o1}) = P({o2}) = P({o3}) = P({o4}). Consider the following events: P={o1,o2}, Q={o2,o3}, R={o3,o4}, S={o1,o2,o3}.
a) P is a subset of Q
b) Q is a subset of P
c) P and Q are disjoint events
d) P and R are mutually exclusive events
