How many types of enzymes are required for the completion of the process of glycolysis?

Glycolysis,the conversion of glucose to pyruvic acid,involves more than seven reactions. Each individual reaction requires:

Number of $ATP$ molecules formed in glycolysis by substrate-level phosphorylation is . . . . . . .

The instantaneous source of energy is

If $3$ molecules of $PGAL$ complete glycolysis,how much $ATP$ and $NADH_2$ will be formed?

Select the correct sequence of reactions in glycolysis:
$(a)$ $3$-phosphoglyceraldehyde $\rightarrow$ $1,3$-biphosphoglycerate
$(b)$ $3$-phosphoglyceric acid $\rightarrow$ $2$-phosphoglycerate
$(c)$ $1,3$-biphosphoglyceric acid $\rightarrow$ $3$-phosphoglyceric acid
$(d)$ Splitting of $1,6$-fructose biphosphate to dihydroxyacetone phosphate and $3$-phosphoglyceraldehyde