Define the following sets:
A = {{Elm}, {Pine}}
B = {Elm, Oak, Maple}
C = {Elm, Vine, Birch, Maple}
D = {Tree, Disease, Street}
List the elements of each of the following sets or calculate the cardinality (as indicated):
a) {X ? P(C): |X| is even}
b) A ? P(B ? C)
c) |P(C x D)|
d) |P(B ? D)|