Consider the following statements about vaccination/ vaccines – Which is/are correct? - In vaccination, a preparation of antigenic proteins of pathogen or inactivated/weakened pathogen are introduced into the body - The vaccines generate memory – B and T-cells and that overwhelm the invaders with a massive production of antibodies - Large scale production and greater availability for immunisation of hepatitis B vaccine is produced from bacteria - A large number of infectious diseases like polio, diphtheria, pneumonia and tetanus have been controlled to a large extent by the use of vaccines