When changes are made to more than one of a collection’s items using setData( ‘some’, ‘value’), which of the following methods will save the changes in the collection?

When changes are made to more than one of a collection’s items using setData( ‘some’, ‘value’), which of the following methods will save the changes in the collection?
A. $collection->saveAll();
B. $collection->saveItems ();
C. $collection->saveAllItems ()?
D. $collection->save();

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