Filiform apparatus is a feature of

In an embryo sac,three cells located at the chalazal end are known as $-$

The ovule of $Capsella$ is:

$A$ typical mature embryo sac of an angiosperm is:

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 of the following is not a part of the Gynoecium?