Which layer includes cloud services, a B2B layer that holds all the commercial transactions, and a database server that supplies production data in a structured form?

Which layer includes cloud services, a B2B layer that holds all the commercial transactions, and a database server that supplies production data in a structured form?

• A. The client or presentation layer
• B. The business logic layer
• C. web-server logic layer
• D. database layer

Answer: (D)

Data persistence and structured data access are handled by the database layer. This layer includes the database server that stores production data in a structured form and serves it to other parts of the system through queries and data services. Cloud services can act as storage or data delivery mechanisms within this layer, and the B2B transactional data is stored and retrieved here to ensure consistent, structured access across the application. The other layers focus on presenting information to users, applying business rules, or handling server-side logic, but they do not primarily store or supply production data. Hence, the described components fit the database layer.

Data persistence and structured data access are handled by the database layer. This layer includes the database server that stores production data in a structured form and serves it to other parts of the system through queries and data services. Cloud services can act as storage or data delivery mechanisms within this layer, and the B2B transactional data is stored and retrieved here to ensure consistent, structured access across the application. The other layers focus on presenting information to users, applying business rules, or handling server-side logic, but they do not primarily store or supply production data. Hence, the described components fit the database layer.