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The resistance \( R_{\mathrm{t}} \) of a conductor varies with temperature \( t \) as shown in the figure. If the variation is
\( \mathrm{P} \) represented by \( R_{t}=R_{0}\left[1+\alpha t+\beta t^{2}\right] \).

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(A) \( \alpha \) and \( \beta \) are both negative
(B) \( \alpha \) and \( \beta \) are both positive
(C) \( \alpha \) is positive and \( \beta \) is negative
(D) \( \alpha \) is negative and \( \beta \) is positive
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