Antibodies in our body are complex

Antibodies defend the body from the invading antigen by:

Consider the following four statements $(i-iv)$ regarding kidney transplantation and select the two correct ones.
$(i)$ Even if a kidney transplant is successful,the recipient needs to take immunosuppressants for a long time.
$(ii)$ Cell-mediated immune response is responsible for the rejection of the graft.
$(iii)$ $B$-lymphocytes are responsible for the rejection of the graft.
$(iv)$ The acceptance or rejection of a transplanted kidney depends on specific interferons.

In $T$-lymphocytes,what does the letter '$T$' stand for?

Match the following columns:

Column-$I$	Column-$II$
$1.$ Saliva and tears	$a.$ Cytokine barrier
$2.$ Mucus coating	$b.$ Cellular barrier
$3.$ $PMNL$	$c.$ Physiological barrier
$4.$ Interferons	$d.$ Physical barrier

Many vertebrates produce virus-resistant substances that inhibit viral replication. What are these substances known as?