Which of the following is characteristic feature of Fabaceae?
(a) Descending imbricate, ten stamens, diadelphous, ovary inferior
(b) Sepals five, gamosepalous, imbricate aestivation, axile placentation
(c) Monocarpellary, ovary inferior, style long, slightly bent at the apex
(d) Zygomorphic flowers, vexillary aestivation in corolla, monocarpellary, ovary superior, diadelphous, ten stamens, many ovules, placentation marginal