Which of the following approaches does not give the defined action of contraceptive ?

1. A. Barrier methods — prevent fertilization
2. B. Intra uterine devices — Increase phagocytosis of sperms, suppress sperm motility and fertilizing capacity of sperms
3. C. Hormonal contraceptives — Prevent/retard entry of sperms, prevent ovulation and fertilization
4. D. Vasectomy — Prevents spermatogenesis

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