Who studied the ultrastructure of bundle sheath cells?

In $C_4$ plants,the bundle sheath cells

Which one of the following is a $C_4$ plant?

Given below are two statements:
Statement $I$: The primary $CO_{2}$ acceptor in $C_{4}$ plants is phosphoenolpyruvate $(PEP)$ and is found in the mesophyll cells.
Statement $II$: Mesophyll cells of $C_{4}$ plants lack $RuBisCo$ enzyme.
In the light of the above statements,choose the correct answer from the options given below:

$C_4$ plants are also known as

Identify the location and function of the following structures:
$(1)$ Chloroplast
$(2)$ Cells of Bundle sheath