Which two are true concerning a multitenant container database with three pluggable database?

Which two are true concerning a multitenant container database with three pluggable database?

A.
All administration tasks must be done to a specific pluggable database.

B.
The pluggable databases increase patching time.

C.
The pluggable databases reduce administration effort.

D.
The pluggable databases are patched together.

E.
Pluggable databases are only used for database consolidation.

Explanation:
The benefits of Oracle Multitenant are brought by implementing a pure deployment
choice. The following list calls out the most compelling examples.
* High consolidation density. (E)
The many pluggable databases in a single multitenant container database share its memory and
background processes, letting you operate many more pluggable databases on a particular
platform than you can single databases that use the old architecture. This is the same benefit that
schema-based consolidation brings.
* Rapid provisioning and cloning using SQL.
* New paradigms for rapid patching and upgrades. (D, not B)
The investment of time and effort to patch one multitenant container database results in patching
all of its many pluggable databases. To patch a single pluggable database, you simply unplug/plug
to a multitenant container database at a different Oracle Database software version.
* (C, not A) Manage many databases as one.
By consolidating existing databases as pluggable databases, administrators can manage many
databases as one. For example, tasks like backup and disaster recovery are performed at the
multitenant container database level.
* Dynamic between pluggable database resource management. In Oracle Database 12c,
Resource Manager is extended with specific functionality to control the competition for resources
between the pluggable databases within a multitenant container database.
Note:
* Oracle Multitenant is a new option for Oracle Database 12c Enterprise Edition that helps
customers reduce IT costs by simplifying consolidation, provisioning, upgrades, and more. It is
supported by a new architecture that allows a multitenant container database to hold many
pluggable databases. And it fully complements other options, including Oracle Real Application
Clusters and Oracle Active Data Guard. An existing database can be simply adopted, with no
change, as a pluggable database; and no changes are needed in the other tiers of the application.
12c Oracle Multitenant