Which of the following cells are associated with immune system of body

Assertion : Interferons are a type of'antibodies produced by body cells infected by bacteria.

Reason : Interferons stimulate inflammation at the site of injury.

Given below are two statements :

Statement $I:$Autoimmune disorder is a condition where body defense mechanism recognizes its own cells as foreign bodies.

Statement $II:$Rheumatoid arthritis is a condition where body does not attack self cells.

In the light of the above statements, choose the most appropriate answer from the options given below:

Where are $B\,-$ cells and $T\,-$ cells formed ? How do they differ from each other ?

Differentiate the following and give examples of each:

$(a)$ Innate and acquired immunity

$(b)$ Active and passive immunity