For which function is the range {y | y ≤ 0}?

A. f(x) = - x

B. f(x) = [[x]]

C. f(x) = - | x |

D. f(x) = | x |

I think your answer is the function f(x)=-|x|, since we can write:

f(x)=-x, if x>=0

and:

f(x)=x, if x<0

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