Which Oracle Cloud Infrastructure (OCI) database solution will be most economical for a customer looking to have the elasticity of the cloud with minimal administration and maintenance effort for their DBA tear? 

Answer options:

A. OCI Bare Metal DB Systems
B. OCI Virtual Machine DB Systems
C. OCI Autonomous Database
D. OCI Exadata DB Systems

D

Reference: https://www.oracle.com/a/ocom/docs/oracle-database-exadata-cloud-service-ds.pdf