What are all the subsets of the set?

Question

{-8, 4}
a. 0 with a line through it, {-8}, {4}
b. {-8}, {4}, {-8, 4}
c. {-8}, {4}
d. 0 with a line through it, {-8}, {4}, {-8, 4}

Answer 1

that "zero with a line through it" is called phi

So, which set of subsets includes all possible (including none or all) subsets of {-8,4} ?

Answer 2

I do not know :(

Answer 3

d