Among the following, which is the incorrect statement about the formation of female gamete in humans.

A layer of granulosa cells surrounds primary oocytes forming primary follicles.
 

Ovum is released in the secondary oocyte stage from the secondary follicle.

The ploidy level of oogonia and primary oocyte is the same.

A fluid filled cavity called antrum develops which leads to the formation of tertiary follicle.