Match List-I with List-II with respect to the methods of contraception and their respective actions :

	List I		List II
a.	Vaults	i)	They alter the quality of cervical mucus to prevent entry of sperms
b.	Oral contraceptive pills	ii)	Ejaculated semen would not enter into the female reproductive tract
c.	Sterilisation	iii)	They cover the cervix blocking the entry of sperms
d.	Nirodh	iv)	Surgical intervention blocks gamete transport

	a	b	c	d
1.	i	iii	iv	ii
2.	iii	i	ii	iv
3.	i	ii	iii	iv
4.	iii	i	iv	ii