Monocot stem differs from dicot stem in having

The transverse section of a plant material shows the following anatomical features under microscope $:-$
$(a)$ Collenchymatous hypodermis
$(b)$ Sclerenchymatous pericycle located just above phloem bundles in semi-lunar patches.
$(c)$ Vascular bundles are arranged in a ring.
$(d)$ Vascular bundles are conjoint & open.
Plant material should be :

In $Barley$ stem,vascular bundles are:

In ......... vascular bundles,they are surrounded by a sclerenchymatous bundle sheath.

In monocot stem,vascular bundles are.

Closed vascular bundles lack