Explanation
Explanation:
IaaS has a number of key benefits for organizations, which include but are not limited to these: -- - Usage is metered and priced on the basis of units (or instances) consumed. This can also be billed back to specific departments or functions.
- It has an ability to scale up and down infrastructure services based on actual usage. This is particularly useful and beneficial where there are significant spikes and dips within the usage curve for infrastructure.
- It has a reduced cost of ownership. There is no need to buy assets for everyday use, no loss of asset value over time, and reduced costs of maintenance and support.
- It has a reduced energy and cooling costs along with "green IT" environment effect with optimum use of IT resources and systems.

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 Uptime Institute publishes the most commonly used and widely known standard on data center tiers and topologies. It is based on a series of four tiers, with each progressive increase in number representing more stringent, reliable, and redundant systems for security, connectivity, fault tolerance, redundancy, and cooling.

Explanation
During the data-in-use state, the information has already been accessed from storage and transmitted to the service, so reliance on a technology such as digital signatures is imperative to ensure security and complement the security methods used during previous states. Data in transit relies on technologies such as TLS to encrypt network transmission of packets for security. Data at rest primarily uses encryption for stored file objects.
Archived data would be the same as data at rest.