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

In $C_4$ plants,the fixation of $CO_2$ by $PEP$ carboxylase occurs in:

Who proposed the cycle of events leading to the fixation of $CO_2$ in mesophyll and its reduction in bundle sheath?

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:

How many types of photosynthetic cells occur in $C_4$ plants?

Choose the incorrect sentence (for $C_4$ plants).