DRAG DROP
You define a table by using the following statement.
The Teachers table contains one million records. A sample record of the XML data output is as follows:
You plan to create queries against the table based on grade.
You need to recommend which indexes should be applied to the XML fields. The solution must meet the
following requirements:
Reduce the amount of time required to query the table based on grade.
Minimize the size of the index.
What should you recommend? To answer, drag the appropriate index types to the correct fields. Each index
type may be used once, more than once, or not at all. You may need to drag the split bar between panes or
scroll to view content.
Select and Place:
Answer: 
Explanation:
XML indexes fall into the following categories:
* Primary XML index
* Secondary XML index
The first index on the xml type column must be the primary XML index.
XML Indexes (SQL Server)
https://msdn.microsoft.com/en-us/library/ms191497.aspx