Question: A collection view has a data source and a delegate. Collection View asks the data source three questions. Which one is not one of the

A collection view has a data source and a delegate. Collection View asks the data source three questions. Which one is not one of the tree questions?
1. numberOfSections(in:)
2. numberofCells(in:)
3. collectionView(_:numberOfItemsInSection:)
4. collectionView(_:cellForItemAt:)

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