Question: Suppose that for a function f , the equation f (x) = 0 has exactly three real-number solutions. Which of the following statements MUST be

Suppose that for a function f , the equation f (x) = 0 has exactly three real-number solutions.

Which of the following statements MUST be true?

A.f is an invertible function.

B.f has exactly three x-intercepts.

C.f has exactly three y-intercepts.

D.f is a polynomial of degree 3.

I am trying to understand what could be missing but all information is there.

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