Consider following statements:
(i) Contraceptive pills alter the quality of cervical mucus to retard the entry of sperms.
(ii) Saheli is an oral contraceptive, which contains a steroid preparation.
(iii) Saheli is “once a week” pill with very few side effects and high contraceptive value.
(iv) Cervical caps, vaults and diaphragms are reusable.
Which of the above statements are true?