Which layered architecture pattern is commonly applied when refacto…

Question

Which layered architecture pattern is commonly applied when refactoring a monolithic COBOL application?

Accepted Answer

Separating presentation, business logic, and data access into distinct service layers — You want the pattern that separates presentation, business logic, and data access into distinct service layers. That gives you clear boundaries and lets you modernize each layer independently. On real mainframe exams, this concept comes up repeatedly, so make sure you have it locked in.

Answer

Replacing all data access logic with COBOL SORT utilities to enable batch-oriented processing

Answer

Assigning each COBOL program to a separate z/OS LPAR to achieve physical isolation

Answer

Combining all COBOL programs into a single layer to reduce inter-program CALL overhead

Which layered architecture pattern is commonly applied when refactoring a monolithic COBOL application?

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