单选题
The SCOTT user has an index on the ITEM_DESC column of the ITEM table. As part of the year-ending task， SCOTT updates the ITEM_DESC column for most of the rows in the ITEM table. How does this change to the table affect the index？（）
发布日期：2020-04-10
An update in a leaf row takes place.
The index becomes invalid after the update.
The leaf block containing the row to be updated is marked as invalid.
A row in the leaf block of the index for the key value is deleted and inserted.
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