How many months prior to breeding a heifer should both leptospirosis and vibriosis vaccinations be given?

How many months prior to breeding a heifer should both leptospirosis

1.	How many months prior to breeding a heifer should both leptospirosis and vibriosis vaccinations be given?
A.	1-2 prior to breeding
B.	3-4 prior to breeding
C.	4-5 prior to breeding
D.	6-7 prior to breeding
Answer» B. 3-4 prior to breeding