$$\alpha, \beta, \gamma, \delta$$ are roots of the polynomial equation $$P(x) = a_4 x^4 + a_3 x^3 + a_2 x^2 + a_1 x + a_0 = 0$$. Then

A

$$\sum \alpha = a_3$$

B

$$\sum \alpha = \frac{a_3}{a_4}$$

C

$$\sum \alpha\beta = \frac{a_2}{a_4}$$

D

$$\alpha\beta\gamma\delta = \frac{a_0}{a_4}$$