Which two statements are true about metrics in Oracle Enterprise manager?

Which two statements are true about metrics in Oracle Enterprise manager?

A.
Metric extensions are the new way to create metrics that is introduced in Oracle Enterprise
manager Cloud Control.

B.
User-defined metrics are not-supported for the targets monitored by oracle Enterprise Manager
Cloud Control.

C.
User-defined metrics do not need to be migrated to metrics extensions.

D.
Migration of collected, user-defined metric historic data is not supported with oracle Enterprise
manager Cloud Control.

E.
Previous user-defined metrics do not need to be displayed or deleted after they are migrated to
metric extensions.

Explanation:
A, E(not B, not C,not D):
* Metric Extensions are the next generation of User-Defined Metrics, which enable you to extend
Enterprise Manager to monitor conditions specific to the enterprise’s environment by creating new
metrics for any target type. The migration of existing User-Defined Metrics to Metric Extensions is
supported through the Enterprise Manager Command Line Interface (EM CLI).
*Extending Monitoring Capability
OS-Based User-Defined Metrics
SQL-Based User-Defined Metrics
Reference: OracleEnterprise Manager Cloud Control Introduction, Metric Extensions