a) Define the differences between "authorised seller of poisons" and "listed seller of poisons" under the Pharmacy and Poisons Ordinance.

b) Describe the conditions and limitations on sale of Part 1 and Part 2 poisons by an "authorised seller of poisons" and a "listed seller of poisons" respectively.

c) What are the additional restrictions when an authorised seller of poisons sells a poison included in Schedule 3 to the Pharmacy and Poisons Regulations?