Which of the following is a $C_4$ plant?

Which of the following characteristics out of $I, II, III, IV$ are exhibited by $C_{4}$ plants?
$I$. Kranz anatomy
$II$. Oxaloacetic acid
$III$. Large bundle sheath cells
$IV$. Found only in desert area

How many additional $ATP$ molecules are required in the $C_4$ pathway compared to the $C_3$ pathway for the fixation of one molecule of $CO_2$?

In most plants,stomata open during the day and close at night. What is the exception to this?

Suppose $Euphorbia$ and $Maize$ are grown in the tropical area. Which one of them is more efficient in terms of photosynthetic activity?

Succulents are known to keep their stomata closed during the day to check transpiration. How do they meet their photosynthetic $CO_2$ requirements?