Question

the set of ø is (a) ø (b) U (c) A (d) none​

Answer 1

$option (a) \: is \: your \: answer. \\ because \\ ø \: is \: an \: empty \: set.$

ø = {}

And:

{} = An empty set.

Hope it helps!

Answer 2

a. is your answer.

Hope it helps