Use Descartes' Rule of Signs to determine the possible number of positive and negative real zeros of f(x)=6 x^{5}+5 x^{4}+5 x^{3}+5 x^{2}+4 x+7 3 or 1 positive real zeros and 5, 3, or 1 negative real zeros 3 or 1 positive real zeros and 4, 2, or 0 negative real zeros O no positive real zeros and 5, 3, or 1 negative real zeros no positive real zeros and 4, 2, or 0 negative real zeros O 5, 3, or 1 positive real zeros and no negative real zeros

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