Which of the following statement regarding female reproductive system is (are) correct? (i) Myometrium undergoes strong contraction at the time of delivery of baby. (ii) Ovary is secondary female sex organ which produces female gamete and steroid hormones. (iii) Ovarian stroma is divided into two zones: inner cortex and outer medulla. (iv) Infundibulum possess finger like projections which help in collection of ovum after the release of secondary oocyte. (v) A functional mammary gland is the characteristics of all the mammals (including male and female).