Which set of ordered pairs could be generated by an exponential function?
(1, 1), (2, one-half), (3, one-third), (4, one-fourth)
(1, 1), (2, one-fourth), (3, one-ninth), (4, one-sixteenth)
(1, one-half), (2, one-fourth), (3, one-eighth), (4, one-sixteenth)
(1, one-half), (2, one-fourth), (3, one-sixth), (4, one-eighth)