If and are the zeros of the polynomial ax3 + bx2 + cx + d, then the value of 2 + 2 + 2 is _________

• A. ( frac {b^2-2c}{a^2} )
• B. ( frac {b^2-2ca}{a} )
• C. ( frac {b^2-2ca}{a^2} )
• D. ( frac {b^2+2ca}{a^2} )