Sterilisation techniques are generally full proof methods of contraception with least side effects. Yet, this is the last option for the couples because
 

Choose the correct option

1. I and III

2. II and III

3. II and IV

4. I, II, III and IV

Emergency contraceptives are effective if used within 72 hrs of

1. coitus

2. ovulation

3. menstruation

4. implantation