Which of the following contraceptive methods is considered to have the least side effects?

Which of the following contraceptive methods can be used by both males and females?

Which of the following can be used by females as injections or implanted under their skin?

What are the advantages of natural methods of contraception over artificial methods?

$A$: Surgical method of contraception is a terminal method to prevent any more pregnancies.
$R$: Surgical methods of contraception prevent gamete formation.

The process in which a small part of the $vas \ deferens$ is removed or tied up through a small incision is called: