Define f(n) = +¹-(-1)" for all n € Z. Thus, f: Z → Z. Which is correct? Select one: O a. O b. O c. f is a function and is not onto but is one-to-one. f is not a function from Z→→ Z because Z. f is a function and is onto but not one-to-one. f is a function and is not onto and not one-to-one O d. O e. f is a function and is onto and one-to-one.

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