Correct answer - "Delete then re-create the table" : The DeleteTable operation deletes a table
and all of its items. After a DeleteTable request, the specified table is in the DELETING state
until DynamoDB completes the deletion.
"Scan and call DeleteItem" - Scan is a very slow operation for 10 million items and you should
avoid if there is a better way
"Scan and call BatchDeleteItem" - Scan is a very slow operation for 10 million items and you
should avoid if there is a better way