On the set D={0,1,4} a rule f is given by f(x)=±x. Which option correctly describes this rule?
a) It is a function whose range is {0,1,2}.
b) It is not a function because each x in D has two distinct images.
c) It is a function with domain D and range {0,1,2,−1,−2}.
d) It is not a relation on D.