Which all teams have to go through qualifying rounds to play in the World Cup?

Which all teams have to go through qualifying rounds to play in the World Cup?

The Test-playing nations and ODI-playing nations qualify automatically for the World Cup finals, while the other teams have to go through a series of preliminary qualifying tournaments were introduced for the second World Cup, where two of the eight to the leading teams in the ICC Trophy. The number of teams selected through the ICC Trophy. The number of teams selected through the ICC Trophy has varied throughout the years. Currently, six teams are selected for the Cricket World Cup.