Chloroplast containing parenchyma is called

When protoxylem develops towards the periphery, it is called

$A$ : Bast fibres are collenchymatous fibres.

$R$ : Fibres are absent in secondary phloem.

Exarch primary xylem is found in ........

The first formed primary phloem referred as...$A$... The later formed primary pholem is referred as ...$B$...

Choose the correct combinations of $A$ and $B$