To ensure the software upgrade is properly tested, approved, and applied, which of the following processes should the administrator follow?

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A cloud administrator for an ISP identified a vulnerability in the software that controls all the firewall rules for a geographic area.

To ensure the software upgrade is properly tested, approved, and applied, which of the following processes should the administrator follow?
A . Configuration management
B . Incident management
C . Resource management
D . Change management

Answer: A