In the given figure of the cloning vector $pBR322$,what do '$P$' and '$Q$' represent respectively?

Identify '$Z$' and '$Q$' in the given figure of $pBR322$.

$A$: Selection of recombinants due to inactivation of antibiotics is a cumbersome procedure.
$R$: It requires simultaneous plating on two plates having different antibiotics.

The given figure shows the cloning vector $pBR322$. Identify the labels $A, B, C,$ and $D$ correctly.

$A$ - Transformation is a procedure through which a piece of $DNA$ is introduced in a host bacterium.
$R$ - With the help of $PCR$,thousands of $DNA$ copies are formed.

Consider the following statements:
$I.$ Recombinant $DNA$ technology,popularly known as genetic engineering,is a stream of biotechnology which deals with the manipulation of genetic material by man in vitro.
$II.$ $pBR322$ is the first artificial cloning vector developed in $1977$ by Bolivar and Rodriguez from $E. coli$ plasmid.
$III.$ Restriction enzymes belong to a class of enzymes called nucleases.
Which of the statements given above are correct?