What are the domain and range of the relation {(–9, 5), (1, 5), (6, 11), (7, –10)}? a. domain: {–10, 5, 11}; range: {–9, 1, 6, 7}; b. domain: {–9, 1, 6, 7}; range: {–10, 5, 11} c. domain: {1, 5, 6, 7, 11}; range: {–10, –9} d. domain: {–9, 1, 6, 7}; range: {–10, –9, 1, 5, 6, 7, 10, 11}