Your network contains a domain controller that is configured as a DNS server. The server
hosts an Active Directory-integrated zone for the domain.
You need to reduce how long it takes until stale records are deleted from the zone.
What should you do?

A.
From the configuration directory partition of the forest, modify the tombstone lifetime.

B.
From the configuration directory partition of the forest, modify the garbage collection
interval.

C.
From the aging properties of the zone, modify the no-refresh interval and the refresh
interval.

D.
From the start of authority (SOA) record of the zone, modify the refresh interval and the
expire interval.

Explanation:

http://technet.microsoft.com/en-us/library/cc816625%28v=ws.10%29.aspx
Set Aging and Scavenging Properties for a Zone
The DNS Server service supports aging and scavenging features. These features are
provided as a mechanism for performing cleanup and removal of stale resource records,
which can accumulate in zone data over time.
You can use this procedure to set the aging and scavenging properties for a specific zone
using either the DNS Manager snap-in or the dnscmd command-line tool.
To set aging and scavenging properties for a zone using the Windows interface
1. Open DNS Manager. To open DNS Manager, click Start, point to Administrative Tools,
and then click DNS.
2. In the console tree, right-click the applicable zone, and then click Properties.
3. On the General tab, click Aging.
4. Select the Scavenge stale resource records check box.
5. Modify other aging and scavenging properties as needed.
To set aging and scavenging properties for a zone using a command line
1. Open a command prompt. To open an elevated Command Prompt window, click Start,
point to All
Programs, click Accessories, right-click Command Prompt, and then click Run as
administrator.
2. At the command prompt, type the following command, and then press ENTER:
dnscmd <ServerName> /Config <ZoneName> {/Aging <Value>|/RefreshInterval <Value>|/
NoRefreshInterval <Value>}