Consider the following sets: For each proposition given below, determine the value of the integer that satisfies that proposition. Simplify all answers completely.

a) x ∈ {2, 4, 6}
b) y ∈ {-3, 0, 3}
c) z ∈ {-1, 1, 2}
d) w ∈ {0, 5, 10}