C. (2,1) It is a function
set of ordered pair is a function if the number input value has two output values i.e. suppose the ordered pair is of the form (x,y) then the number value of x will have more than 1 value of y.
so here option c is a function (2,1).
How do use order pairs to represent a function?
We call to the first element of an ordered pair is the 1st coordinate, and we call the 2nd element of an ordered pair the 2nd coordinate. To use ordered pairs to represent a function, we let the inputs be the 1st coordinates and the outputs are the second coordinates. Then we just list all of the ordered pairs of a function.
Learn more about function here https://brainly.com/question/15114205
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