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You have a database named DB1. The database does not use a memory-optimized filegroup. The database
contains a table named Table1. The table must support the following workloads:

You need to add the most efficient index to support the new OLTP workload, while not deteriorating the existing
Reporting query performance.
What should you do?

A.
Create a clustered index on the table.

B.
Create a nonclustered index on the table.

C.
Create a nonclustered filtered index on the table.

D.
Create a clustered columnstore index on the table.

E.
Create a nonclustered columnstore index on the table.

F.
Create a hash index on the table.

Explanation:
A filtered index is an optimized nonclustered index, especially suited to cover queries that select from a welldefined subset of data. It uses a filter predicate to index a portion of rows in the table. A well-designed filtered
index can improve query performance, reduce index maintenance costs, and reduce index storage costs
compared with full-table indexes.
https://technet.microsoft.com/en-us/library/cc280372(v=sql.105).aspx