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The default value at which a refresh interval (an interval a sec. server check for zone updates) is 15 minutes.
If this value is increased, the network traffic is reduced. In the eventuality that the refresh interval expires, the secondary zone will contact the primary zone and request it to initiate the zone transfer.
I'm pretty sure it's D. Provide discount software for the underprivileged.
Yes, if you download an app such as gmail or yahoo mail. hope this answered your question.
If the language is zero indexed:
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