You need to optimize the statement

You are developing a database application by using Microsoft SQL Server 2012.
An application that uses a database begins to run slowly.
You discover that the root cause is a query against a frequently updated table that has a clustered
index. The query returns four columns: three columns in its WHERE clause contained in a nonclustered index and one additional column.
You need to optimize the statement.
What should you do?

A.
Add a HASH hint lo the query.

B.
Add a LOOP hint to the query.

C.
Add a FORCESEEK hint to the query.

D.
Add an INCLUDE clause to the index.

E.
Add a FORCESCAN hint to the Attach query.

F.
Add a FORCESCAN hint to the Attach query.

G.
Add a columnstore index to cover the query.

H.
Enable the optimize for ad hoc workloads option.

I.
Cover the unique clustered index with a columnstore index. Include a SET FORCEPLAN ON
statement before you run the query.

J.
Include a SET STATISTICS PROFILE ON statement before you run the query.
K.
Include a SET STATISTICS SHOWPLAN.XML ON statement before you run the query.
L.
Include a SET TRANSACTION ISOLATION LEVEL REPEATABLE READ statement before you run the
query.
M.
Include a SET TRANSACTION ISOLATION LEVEL SNAPSHOT statement before you run the query.

N.
Include a SET TRANSACTION ISOLATION LEVEL SERIALIZABLE statement before you run the query.