Question 6: Let

{a, b, c, d, e} * {a, b, c, d, e}

be an equivalence relation given by the following table, where an x says that the two elements are related by , e.g., we have b ~ a, as there is an x in the 3rd row from the top and the 2^nd column from the left.

~	a	b	c	d	e
a	x	x	x
b	x	x	x
c	x	x	x
d				x
e					x

For v {a, b, c, d, e} define class(v) = {y {a, b, c, d, e} | y v}.

Which of the following holds?

1) Class(a) = {a, b, c}

2) Class(b) = {a, b, c}

3) Class(d) = {d, e}

4) Class(e) = {e}

5) Class(c) = {}