What is the germinal epithelium composed of?

An antrum is the characteristic of $...$ follicles.

$A$ freshly released human ovum contains ...........

Sperm and ovum originate from the . . . . . . .

The provided image is completely unrelated to the question text. The question asks for a diagrammatic presentation of developing follicle events in the human ovary. Based on the standard biological sequence of ovarian follicle development:
$1$. Primary follicles develop into secondary follicles.
$2$. Secondary follicles develop into tertiary follicles.
$3$. Tertiary follicles develop into the Graafian (mature) follicle.
$4$. After ovulation,the ruptured follicle transforms into the corpus luteum.
Given the standard sequence,identify the correct labels for $C$ and $E$ in a typical diagram of this process.

Which type of cell division forms spermatids from the secondary spermatocytes?