Which of the following layers in an antral follicle is acellular?

Zona pellucida layer in an antral follicle is acellular. An antral follicle is also called Graafian follicle.  Inside this follicle, secondary oocytes and fluid-filled cavities called antrum are present. The secondary oocyte is surrounded by layers, an acellular layer called zona pellucida and a cellular layer called corona radiata. Theca interna, ovarian stroma and granulosa    layers contain cells.