In the ID3 (Iterative Dichotomiser 3) algorithm used for building Decision Trees, which of the following statements is correct?

1. AID3 selects the feature with the lowest information gain at each node to maximise entropy.
2. BID3 selects the feature with the highest information gain at each node to reduce uncertainty.
3. CID3 splits the data randomly without considering entropy or information gain.
4. DID3 can only be used for regression problems, not classification.