Select the correct statements regarding oogenesis. (i) It is initiated during the embryonic development stage when millions of oogonia are formed within each ovary. (ii) Graafian follicle releases primary oocyte from the ovary by ovulation. (iii) At puberty, only 60,000 - 80,000 primary follicles are left in each ovary. (iv) Secondary oocyte within tertiary follicles grows in size and completes its second meiotic division.

• A. (i), (ii) and (iii)
• B.        (i) and (iii)
• C. (ii) and (iv)        
• D.        All of the above