The 2026 FIFA World Cup, scheduled to be held in June-July 2026, will feature a significant change in its tournament structure. What is this key change?

1. AIt will be the first World Cup to be held in three different countries.
2. BThe number of participating teams will increase from 32 to 48.
3. CVideo Assistant Referee (VAR) technology will be used for the first time.
4. DAll matches will be played in stadiums with retractable roofs.