Which is a key benefit of using Oracle Cloud Infrastructure Autonomous Data Warehouse? 

Answer options:

A. Maintain root-level access to the underlying operating system.
B. Scale both CPU and Storage without downtime.
C. Apply database patches as they become available.
D. No username and password required.

B

Reference: http://www.oracle.com/us/products/database/autonomous-dw-cloud-ipaper-3938921.pdf