Where are memory cells produced?

The injection of serum from a horse,which has been repeatedly injected with cobra venom,into a person bitten by a cobra results in:

Match the columns:

Column-$I$	Column-$II$
$(a)$ Physical barrier	$(1)$ Skin
$(b)$ Physiological barrier	$(2)$ Interferon protein
$(c)$ Cellular barrier	$(3)$ Leucocytes
$(d)$ Cytokine barrier	$(4)$ Saliva in the mouth

Passive immunity is obtained through the introduction of which of the following?

In the case of a snakebite, the patient is injected with preformed antibodies against the snake venom. This type of immunity is called.........

Read the following statements and choose the correct set of statements $:$
$(a)$ Cell-mediated immune response is responsible for the graft rejection.
$(b)$ Grafts from just any source $-$ an animal,another primate,or any human beings can be made since the grafts would be accepted sooner or later.
$(c)$ The organs cannot be taken from just anybody for transplant.
$(d)$ Tissue matching,blood group matching are essential before undertaking any graft/transplant.
Choose the correct answer from the options given below $:$