*D. Exactly one?*

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Let $a$ be the root of the polynomial $f(x)$ of multiplicity 1. Then $a$ is a root of polynomial $((x-a) / 2) (f’(x) + f’(a)) – f(x) +f(a)$ of multiplicity

- exactly 4
- at least 4
- at most 2
- exactly 1

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