Which three are key elements in the plugin.xml file for Oracle Enterprise Management?

https://docs.oracle.com/cd/E24628_01/doc.121/e25161/security.htm#EMPRF12046

16.2.1 Overview of Credential Elements
The key elements that define credentials are described in the following table:

Table 16-1 Key elements in a plugin.xml file

Element Required (Y/N) Description
CredentialInfo

Y

The root element for the credentials definition. Contains CredentialType and CredentialSet elements.

CredentialType

Y

Contains one or more CredentialTypeColumn elements, each defining a credential such as “TargetUsername” or “TargetPassword”. Used to access target instances.

CredentialSet

Y

Instatiates an instance of the credential set defined in CredentialType. It includes the following attributes:

CREDENTIAL_TYPE

Identifies the CredentialType from which this CredentialSet is created.

USAGE

Values are MONITORING (default), which is used to directly connect to the target, PREFERRED_CRED, which is the user’s preferred credentials, or SYSTEM, which is used by specialized applications such as patching or cloning.

CredentialSetColumn

Y

A subelement of CredentialType. Defines a single credential and maps that credential to its corresponding column in the CredentialType. It includes the following attributes: