Two conductors have the same resistance at $$0^\circ$$C but their temperature coefficients of resistance are $$\alpha_1$$ and $$\alpha_2$$. The respective temperature coefficients of their series and parallel combinations are nearly

A

$$\frac{\alpha_1 + \alpha_2}{2}, \alpha_1 + \alpha_2$$

B

$$\alpha_1 + \alpha_2, \frac{\alpha_1 + \alpha_2}{2}$$

C

$$\alpha_1 + \alpha_2, \frac{\alpha_1 \alpha_2}{\alpha_1 + \alpha_2}$$

D

$$\frac{\alpha_1 + \alpha_2}{2}, \frac{\alpha_1 + \alpha_2}{2}$$