Which of the following approaches does not give the defined action of contraceptive?
(a) Intra uterine devices Increase phagocytosis of sperms,suppress sperm motility and fertilising capacity of sperms
(b) Hormonal contraceptives Prevent/ retard entry of
sperms, prevent ovulation and fertilisation
(c) Vasectomy Prevents spermatogenesis
(d) Barrier methods Prevent fertilisation