NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Determine whether each of these proposed definitions is a valid recursive definition of a function ffrom the set of nonnegative integers to the set of integers. If fis well defined, find a formula for f(n) when n is a nonnegative integer and prove that your formula is valid. f(0)=1, f(n) = f(n-1)-1 for n≥1 Choose the correct statement. (You must provide an answer before moving to the next part.) Multiple Choice О The definition of fis not valid because f(n) decreases as n increases. О The definition of fis not valid because defining (1) would require (-1), which is not available.

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