The array is incomplete. Please provide the complete data so that it can be corrected with the correct formatting and spaces.
a) The domain of the "element of" relation, r, is the set u.
b) The domain of the "element of" relation, r, is the set p.u.
c) The domain of the "element of" relation, r, is the set x.
d) The domain of the "element of" relation, r, is the set s.