Which Set of Ordered Pairs Is a Function? for Each

Multiple Choice

Which set of ordered pairs is a function? For each function, name the set of inputs (domain) and the set of outputs (range) . a. (9, 99) , (9, 999) , (9, 9999)
b. (-4, 8) , (-5, 8) , (-6, 8)

A) a is a function. Domain is {9}, range is {99, 999, 9999}.
B) b is a function. Domain is {-4, -5, -6}, range is {8}.
C) a is a function. Domain is {9}, range is {99, 999, 9999}.
B is a function. Domain is {-4, -5, -6}, range is {8}.
D) b is a function. Domain is {9}, range is {99, 999, 9999}.
A is a function. Domain is {-4, -5, -6}, range is {8}.
E) a and b are not functions.