Which of the following is true for a typical mature embryo sac?

Match the following columns:

Column-$I$	Column-$II$
$(a)$ Synergids	$(1)$ Female gamete
$(b)$ Central cell	$(2)$ Chalazal end
$(c)$ Antipodals	$(3)$ Filiform apparatus
$(d)$ Egg cell	$(4)$ Polar nuclei

Eight nucleated female gametophyte is found in

Which one of the following is unlike other nuclei in the embryo sac of angiosperms regarding ploidy?

Given below are two statements: One is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A):$ $A$ typical unfertilised,angiosperm embryo sac at maturity is $8$-nucleate and $7$-celled.
Reason $(R):$ The egg apparatus has $2$ polar nuclei.
In the light of the above statements,choose the correct answer from the options given below:

Which one is the female gametophyte in angiosperms?