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Given $P(x) = x^4 + ax^3 + bx^2+cx+d$ such that $x=0$ is the only real root of $P'(x) = 0$. If $P(-1) < P(1)$, then in the interval $[-1, 1]$

( A ) P(-1) is not minimum but P(1) is the maxium of P
( B ) P(-1) is the minimum and P(1) is the maximum of P
( C ) P(-1) is the minimum and P(1) is not the maximum of P
( D ) neither P(-1) is the minimum nor P(1) is the maximum of P

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