6.
What is the domain of this function?
(12, 5)
(17, -17)
(2, 2)
(1,5)
(4, 6)
(14, 16)
A. {1, 2, 4, 12, 14, 17}
B. {-17, 2, 5, 6, 16}
C. {2}
D. {-17, 1, 2, 4, 5, 6, 12, 14, 16, 17}