Identify the odd one out.

Give information about natural methods useful as contraceptives.

Which of the following is the terminal method of contraception?

Identify the odd one out among the following copper-releasing $IUDs$.

Assertion : Copper $-T$ is an effective contraceptive device in human females.
Reason : Copper $-T$ prevents passage of sperms from vagina upwards into fallopian tubes.

In this method,the male partner withdraws his penis from the vagina just before ejaculation to avoid insemination.