The resistance\[{{R}_{t}}\] of a conductor varies with temperature t as shown in the figure. If the variation is represented by \[{{R}_{t}}={{R}_{0}}[1+\alpha t+\beta {{t}^{2}}]\], then [CPMT 1988]

• A. \[\alpha \] and \[\beta \] are both negative
• B. \[\alpha \] and \[\beta \] are both positive
• C. 10 units    
• D. \[\alpha \] is negative and \[\beta \] are positive