A. Items "book1", "book2", and "book3" will be inserted or updated. The name property of item "book3" will be erased, but other properties won't be affected.

B. Items "book1", "book", and "book3" will be inserted or updated. It updated, all their existing property values will first be erased

C. Items "book1", "book2", and "book3" will be inserted or updated, but any leading and trailing spaces in the field values will be ignored

D. No entries will be updated or inserted.