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Which of the following sequences of development of embryo sac / female gametophyte is correct?
(a) Nucellus → Megaspore → Embryo sac
(b) Nucellus → Megaspore mother cell → Megaspore → embryo sac
(c) Nucellus → Megasporangium → Megaspore → Embryo sac
(d) Nucellus → Megagametophyte → Megaspore → Embryo sac