What are the DS you can have on birth control based on the following:

1st dispense
2nd dispense
Thereafter
a) 1 pack, 3 packs, 12 packs
b) 3 packs, 6 packs, 12 packs
c) 1 pack, 6 packs, 12 packs
d) 1 pack, 6 packs, 9 packs