Which two reasons should you identify?

Your network contains a System Center 2012 R2 Configuration Manager Service Pack 1 (SP1)
environment.
The Client Status node in the Configuration Manager console shows a downward trend in client
health.
You verify the logs on several clients.
You discover that the clients are healthy and are communicating normally to management points.
You need to identify the reasons why the Configuration Manager console displays a downward trend
in client health.
Which two reasons should you identify? Each correct answer presents a complete solution.

A.
The Active Directory sites that are members of boundary groups are modified.

B.
The age set in the Delete Aged Discovery Data maintenance task is shorter than the Heartbeat
Discovery interval.

C.
The Delete Obsolete Client Discovery Data site maintenance task is disabled.

D.
In Client Status Settings Properties, the Hardware inventory during the following days interval is
shorter than the Hardware inventory interval.

E.
Microsoft SQL Server replication to the management points stopped.

Explanation:
The Delete Obsolete Client Discovery Data task deletes obsolete client records from the
Configuration Manager site database. A record that is marked obsolete typically was superseded by
a newer record for the same client. The newer record becomes the client’s current record, and the
older record becomes obsolete.
When you enable this task, you should configure the schedule to run at an interval greater than the
heartbeat discovery schedule. This allows clients to send Discovery Data Records (DDRs) so that the
obsolete bit is set correctly.

Delete Obsolete Client Discovery Data Task Overview
https://technet.microsoft.com/sv-se/library/Bb632879.aspx