Which of the following is an $E. coli$ cloning vector?

The most important feature in a plasmid to be used as a vector is

Identify the $DNA$ sequence which can be cut using $EcoRI$.

In $EcoRI$,the letter $R$ stands for:

$A$ set of bacterial clones,each containing a plasmid or phage,is called

The diagram below represents a schematic of recombinant $DNA$ technology. Which enzymes are responsible for the processes $P$ and $Q$ respectively?
$\quad\quad P\quad\quad\quad Q$