The correct answer to the question is option A (IaaS)
Explanation:
IaaS (Infrastructure as a Service) can be used for data storage, backup, recovery, web hosting, and various other uses as it is cost-effective, and it also has secured data centers. It is a service delivery method by a provider for cloud computing as it enables customers to be offered the service the possibility to combine basic computing
services to build and direct access to safe servers where networking can also be done. These services rendered by the providers allow users to install operating systems thereby making it possible to build highly adaptable computer systems.
SaaS (Software as a Service): Here, the service provider bears the responsibility of how the app will work as what the users do is to access the applications from running on cloud infrastructure without having to install the application on the computer.
The cloud provider (CP) as the name suggests is anybody or group of persons that provide services for operations within the cloud.
Hierarchy of data is defined as arrangement of data in systematic way .The arrangement of files,character,records etc is done in a particular order usually in terms of highest level and lowest level .
According to the question ,hierarchy of data should be used for organizing data from smallest stage to highest stage for database designing.
Other options are incorrect alphabetical designing is based on alphabetical order. Detail structure is a model made on basis of details and features.
Data design is the model or structure that includes data and related factors as building block.Logical order is the organizing elements on basis of particular logic.