Bulliform cells are the modification of

The vertical section of a dorsoventral leaf through the lamina shows three main parts namely,epidermis,$A$,and vascular system. The epidermis,which covers the upper surface is $B$ and the lower surface is covered by $C$ of the leaf. Choose the correct combination of $A$,$B$,and $C$.

The location of bulliform cells is $...................$

Usually the lower surface of a $...$ leaf has a greater number of stomata while in a $...$ leaf they are about equal on both surfaces.

Multiple epidermis on the dorsal and ventral sides of the leaf is found in:

Bulliform cells are .......