What are the domain and range of the function {(3, 1), (5, –1), (9, –1), (2, 7), (–4, 1)}?

a.
domain: {3, 5, 9, 2 }; range: {1, 7}

b.
domain: {3, 5, 9, 2, –4}; range: {1, –1, 7}

c.
domain: {1, –1, 7}; range: {3, 5, 9, 2, –4}

d.
domain: {1, 7}; range: {3, 5, 9, 2 }