Find the Domain and Range

Multiple Choice

Find the domain and range.
- {(7,2) ,(7,-7) ,(7,-5) }

A) Domain: {2,7} ; range: {-7,-5}
B) Domain: {-7,-5,2} ; range: {7}
C) Domain: {7} ; range: {-7,-5,2,7}
D) Domain: {7} ; range: {-7,-5,2}