Final answer:
Vaccination is the best method to elicit a memory response and recruit multiple types of immune cells, as it leads to artificially acquired active immunity without causing disease.
Step-by-step explanation:
The best response to induce a memory response and recruit multiple types of immune cells is through A) Vaccination. Vaccination is a means of artificially acquired active immunity. It works by exposing the immune system to noninfectious antigens derived from pathogens. This exposure generates a primary immune response without causing disease and leads to the creation of memory cells. These memory cells enable a quicker and more robust secondary response upon subsequent exposure to the same pathogen, providing long-term protection.
In contrast, natural infection can lead to a memory response but at the risk of illness, antibiotics treat bacterial infections and do not lead to immunological memory, and steroids are mainly anti-inflammatory drugs and do not confer immunity. Vaccination may include booster shots to reinforce or extend immunity, such as tetanus boosters needed every ten years. Also, vaccines can be designed to stimulate B-cells and T-cells, which are both involved in producing a targeted response upon re-exposure to the antigen.