In an acid-base titration, 0.1 M HCl solution was added to the NaOH solution of unknown strength. Which of the following correctly describes the reaction that occurs during the titration?
1) HCl reacts with NaOH to form water and a salt.
2) HCl reacts with NaOH to form water and hydrogen gas.
3) HCl reacts with NaOH to form water and sodium chloride.
4) HCl reacts with NaOH to form water and sodium hydroxide.