The domain of a function is?A.The set of all points on the function. B.The set of all first elements of the function.C.The set of all second elements of the function.

The correct answer is B) The set of all first elements of the function. Let's say you had these three points on a graph of a function: (0.9), (2.6), (4,7). The domain of these three points would be (0,2,4). The domain is just the input for which the function is defined. Hope this helps.