Which of the following sets are equal?

Question 15 options: Selct the correct answer.

a)

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

b)

{c, b, a, d} = {a, b, c, d}

c)

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

d)

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