What protocol do these tiers use to communicate with ea…

The Exadata architecture is divided into two specific tiers: the database tier and the storage tier.
What protocol do these tiers use to communicate with each other?

A.
iDB – Intelligent Database Protocol

B.
InfiniBand protocol

C.
Ethernet protocol

D.
Secure Shell protocol

E.
Fibre Channel protocol

Explanation:
https://docs.oracle.com/cd/E50790_01/doc/doc.121/e50471/concepts.htm#SAGUG20333