You administer a Microsoft SQL Server 2012 instance that has multiple databases. You have a two-node SQL
Server failover cluster. The cluster uses a storage area network (SAN). You discover I/O issues. The SAN is at
capacity and additional disks cannot be added.
You need to reduce the I/O workload on the SAN at a minimal cost.
What should you do?

A.
Move user databases to a local disk.

B.
Expand the tempdb data and log files

C.
Modify application code to use table variables

D.
Move the tempdb files to a local disk

Explanation:
The use of local disks for TempDB allows us to have more flexibility when configuring for optimal performance.
It is a common performance recommendation to create the TempDB database on the fastest storage available.
With the capability to utilize local disk for TempDB placement we can easily utilize disks that are larger, have a
higher rotational speed or use SSD disks.
https://www.mssqltips.com/sqlservertip/2817/sql-server-2012-cluster-with-tempdb-on-local-disk/