Which is the classification of the following grammar.

$$

$\backslash$begin$\{$array$\}\{$lll$\}$

S $\backslash$rightarrow A B $\backslash \backslash$

A $\backslash$rightarrow a A & $\backslash \backslash$

B $\backslash$rightarrow & a $\backslash \backslash$

B & $\backslash$rightarrow

$\backslash$end$\{$array$\}$

$$

I. Linear grammar

II$.$ Right linear grammar

III. Left linear grammar

IV$.$ Regular grammar

V$.$ Not a regular grammar