Which of the following requires the injection of preformed antibodies or antitoxins into the body to provide immunity?

In the given figure,what does the part labeled '$A$' represent?

Antibodies fight against:

The immunity acquired by the fetus from the mother through the placenta or by the infant from mother's milk for a short period is known as:

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 $:$

Match the following barriers of innate immunity with their respective examples and select the correct option:

List-$I$ (Barrier)	List-$II$ (Example)
$A$. Physical barrier	$i$. Skin
$B$. Physiological barrier	$ii$. Interferons
$C$. Cellular barrier	$iii$. Mucus coating
$D$. Cytokine barrier	$iv$. Saliva in mouth