Passage: A game is officiated by a referee, who has "full authority to enforce the Laws of the Game in connection with the match to which he has been appointed" (Law 5), and whose decisions are final. The referee is assisted by two assistant referees. In many high-level games there is also a fourth official who assists the referee and may replace another official should the need arise.Goal line technology is used to measure if the whole ball has crossed the goal-line thereby determining if a goal has or hasn't been scored, this was brought in to prevent there being controversy. Video assistant referee (VAR) has also been increasingly introduced to assist officials through video replay to correct clear and obvious mistakes. There are four types of calls that can be reviewed: mistaken identity in awarding a red or yellow card, goals and whether there was a violation during the buildup, direct red card decisions, and penalty decisions.

Question: During a game of soccer, how many referees help the lead referee?
two