A mother asks the practical nurse (PN) about the immunization schedule for whooping cough. Which is the recommended schedule that the PN should convey?

Birth, 2 months, 12 months and boosters every 7 to 10 years.

1,6,9 months, and boosters at 12 months of age and before entering school.

1 year of age, 6 years of age, and with each exposure.

2.4.6 months, and boosters at 15 to 18 months and 4 to 6 years of age.