The correct answer is: B. A cloud architecture maintained within an enterprise data center.
A private cloud is a cloud computing environment that is operated solely for a single organization. It can be hosted on-premises or off-premises, and it is typically managed by the organization’s own IT department. Private clouds offer a number of advantages over public clouds, including greater security, control, and compliance.
A standard cloud service offered via the Internet is a public cloud. A cloud service inaccessible to anyone but the cultural elite is not a cloud service at all.