Give the Domain and Range of the Relation

Multiple Choice

Give the domain and range of the relation.
-{(1, -7) , (7, 1) , (3, -1) , (3, 4) }

A) domain = {1, 3, 7}; range = {-7, -1, 1, 4}
B) domain = {-7, -1, 1, 4}; range = {1, 3, 7}
C) domain = {1, 3, 7, 13}; range = {-7, -1, 1, 4}
D) domain = {1, 3, 7, -3}; range = {-7, -1, 1, 4}