What conclusion should be drawn when ADDI reports that a copybook member has zero references in the application portfolio?

Think of it like working hands-on with IBM mainframe systems — the answer here is 'The copybook is a system-level resource maintained by IBM and must not be modified'. A copybook with zero references from any COBOL program in the portfolio is effectively dead and can be excluded from modernization scope, reducing the volume of data structures that must be mapped to . On real mainframe exams, this concept comes up repeatedly so make sure you have it locked in.