If k lies between roots α and β of a quadratic Equation f(x) and a>0, then
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(a)xk+h.{(fk−1−fk)(2fk−fk−1−fk+1)} (b) xk+h.{(fk−fk−1)(2fk−fk−1−fk+1)}(c) xk+h.{(fk−fk−1)(fk−2fk−1−fk+1)} (d) xk+h.{(fk−fk−1)(fk−fk−1−2fk+1)}