Explanation/Reference:
A: The Oracle Management Service (OMS) provides the services used to coordinate the storage of
management information and the automation of management activities for all entities managed in the
network. It also includes facilities for serving the web-based user interface, which is the Cloud Control
console.
B: The Management Agent is the lightweight process that acts as a proxy for Enterprise Manager on the
various hosts in the network where entities that Enterprise Manager manages are located. It
communicates with the OMS to collect and deliver monitoring information and to coordinate management
activities executed against the management entities.
E: The Management Repository is the Oracle Database that stores all important management information
for the entities managed by Enterprise Manager. The Oracle Management Service (OMS) uses the
Management Repository to store and retrieve key information, such as monitoring data.
Reference: Oracle Enterprise Manager Cloud Control Extensibility Programmer's Guide