Which statement is true about Exadata Storage Servers? 

The Exadata Storage Server automatically deletes old diagnostic and metric files. 

Exadata requires a running database instance on all storage servers and database servers. 

Redundancy for user data stored in a database that is running on Exadata is achieved with RAID5. 

Communication between a database and an Exadata storage flows over low latency 10 Gigabit Ethernet. 

Exadata uses network affinity to determine which storage server data is written.