Match the following columns regarding the components of the embryo sac:

Column $I$	Column $II$
$(a)$ Sex cell	$(1)$ Synergid cells
$(b)$ Synergid cell	$(2)$ Antipodal cells
$(c)$ Cell opposite to micropyle	$(3)$ Egg cell
$(d)$ Central cell	$(4)$ Secondary nucleus

(A) The correct matching is as follows:
$(a)$ Sex cell of the embryo sac is the $(3)$ Egg cell.
$(b)$ Synergid cells are the $(1)$ Synergid cells present in the embryo sac.
$(c)$ Cells opposite to the micropyle are the $(2)$ Antipodal cells.
$(d)$ The $(4)$ Secondary nucleus is located within the central cell of the embryo sac.
Therefore, the correct sequence is $(a-3), (b-1), (c-2), (d-4)$.