The relying party is attached to the application or service that a user is trying to access, and it accepts authentication tokens from the user's own identity provider in order to facilitate authentication and access. The other terms provided are all associated with federated systems, but none is the correct choice in this case.

Explanation
Regardless of the cloud service category used, the physical environment is always the sole responsibility of the cloud provider. In many instances, the cloud provider will supply audit reports or some general information about their physical security practices, especially to those customers or potential customers that may have regulatory requirements, but otherwise the cloud customer will have very little insight into the physical environment. With IaaS, the infrastructure is a shared responsibility between the cloud provider and cloud customer. With all cloud service categories, the data and governance are always the sole responsibility of the cloud customer.

Explanation
The standards put out by the International Data Center Authority (IDCA) have established the Infinity Paradigm, which is intended to be a comprehensive data center design and operations framework. The Infinity Paradigm shifts away from many models that rely on tiered architecture for data centers, where each successive tier increases redundancy. Instead, it emphasizes data centers being approached at a macro level, without a specific and isolated focus on certain aspects to achieve tier status.

Explanation
Firewalls take into account source IP, destination IP, the port the traffic is using, as well as the network protocol (UDP/TCP). Whether or not the traffic is encrypted is not something a firewall is concerned with.