Which of the following methods of contraception are similar in action?

Oral contraceptives and implants are comprised of hormonal preparation i.e., progesteron alone or in combination with oestrogen. They inhibit ovulation and implantation as well as alter the quality of cervical mucus to prevent/retard entry of sperms.

Rhythm method (periodic abstinence) is the abstinence from coitus around the time of ovulation while pills inhibit ouvlation.

LNG-20 is an IUD (hormonal) while diaphragm is a barrier.

Saheli is a non-steroidal pill while vasectomy is surgical method which blocks transport of sperm.