How many $NADH + H^+$ molecules are produced during the process of glycolysis?

During glycolysis,the enzyme hexokinase converts glucose to glucose-$6$-phosphate. The activity of hexokinase is inhibited by glucose-$6$-phosphate through which of the following mechanisms?

Glycolysis:
$I$. Causes partial oxidation of glucose (one molecule) to form $2$ molecules of pyruvic acid and $2$ $ATP$ as net gain.
$II$. Takes place in all living cells.
$III$. Uses $2$ $ATP$ at two steps.
$IV$. Scheme was given by Gustav Embden,Otto Meyerhof,and $J$. Parnas.
Choose the correct option containing appropriate statements from the above.

Which of the following processes occurs in glycolysis?

What is the end product of glycolysis?

Which of the following is the first step of glycolysis?