In photosynthesis,where do the reactions that do not require light occur?

Where does the dark reaction of photosynthesis take place?

In the dark reaction,the regeneration of $6$ $RuBP$ molecules requires how many molecules of $ATP$?

Which enzyme is responsible for primary carboxylation in $C_3$ plants?

$3 CO_{2} + 9 ATP + 6 NADPH + \text{water} \rightarrow \text{glyceraldehyde 3-phosphate} + 9 ADP + 6 NADP^{+} + 8 \Pi$. Analyse the above reaction and answer the following questions:
$(a)$ How many molecules of $ATP$ and $NADPH$ are required to fix one molecule of $CO_{2}$?
$(b)$ Where in the chloroplast does this process occur?

Select the correct option for photosynthesis in $C_3$-plants.