Which of the following cells are involved in the defence mechanism of the body?

Given below are two statements.
Statement $I$: Passive immunity is acquired when readymade antibodies are received by body cells.
Statement $II$: Resistance induced by $BCG$ vaccine is an example of passive immunity.
In the light of the above two statements,choose the correct answer from the options given below.

When ready-made $ antibodies $ are directly given to protect the body against foreign agents, it is called passive immunity.

Active immunity may be acquired by

Breastfeeding can be categorized under which type of immunity?

Identify the barrier of innate immunity in which virus-infected cells secrete proteins called interferons.