Comprehensive and Detailed Explanation

Let’s examine each statement against the TOGAF ADM principles:

All ADM activities are carried out within an iterative cycle of continuous architecture definition and realization

Correct. The ADM is iterative in three dimensions: across the cycle, between levels (enterprise, segment, capability), and within phases. This means architecture development is never linear but part of a continuous cycle of definition and realization.

The Requirements Management phase is a continuous phase

Correct. Requirements Management is central to the ADM cycle. It operates continuously, ensuring requirements are identified, stored, and addressed throughout all phases, not only in a single step.

Output from an early phase may be modified in a later phase

Correct. The ADM is iterative and allows feedback between phases. For example, new requirements identified in later phases may lead to modifications of deliverables from earlier phases.

When a phase starts, the previous phase closes

Incorrect. The ADM is not strictly sequential. Phases can overlap, iterate, and provide feedback loops. One phase starting does not imply that the previous phase is closed; instead, phases interact dynamically.

Correct Mapping

Statements 1, 2, and 3 are correct.

Statement 4 is incorrect.

Correct answer is B (1, 2 & 3).

Why the other options are incorrect

A (2, 3 & 4): Includes statement 4, which is incorrect.

C (1, 2 & 4): Includes statement 4, which is incorrect.

D (1, 3 & 4): Includes statement 4, which is incorrect.

References

The Open Group, TOGAF® Standard, Version 9.2, Part II: ADM — overview of ADM iterations, Requirements Management, and feedback between phases.

The Open Group, TOGAF® 9 Certified Study Guide — emphasizes ADM as iterative and requirements-driven.