Explanation:

Ovulation, recurring every reproductive cycle of the mammalian female and triggered by a surge of luteinizing hormone (LH) released from the pituitary is an essential prerequisite for fertilization and subsequent embryonic development.

• The hypothalamus secretes GnRH in a pulsatile fashion, which triggers FSH and LH release from the anterior pituitary. These, in turn, act on the granulosa and theca cells in the ovary to stimulate follicle maturation and trigger ovulation.

Hence option 2nd is correct.