If p ,q ,r ,s are rational numbers and t...

If `p ,q ,r ,s` are rational numbers and the roots of `f(x)=0` are eccentricities of a parabola and a rectangular hyperbola, where `f(x)=p x^3+q x^2+r x+s` ,then `p+q+r+s=` a. `p` b. `-p` c. `2p` d. `0`

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