To answer this question, you need to understand the concept of configuration management. Let's go through each option to understand why it is correct or incorrect:
Option A) Agile testing methodology - This option is incorrect because Agile testing methodology is a project management and development approach that focuses on iterative and incremental development. While it may provide benefits in terms of collaboration and flexibility, it does not specifically address the ability to reference all documents and software items unambiguously.
Option B) Effective use of tools - This option is incorrect because although the effective use of tools can enhance the testing process, it does not necessarily ensure the ability to reference all documents and software items unambiguously. Tools can help with tasks such as test management, defect tracking, and automation, but they do not provide a systematic approach for unambiguous referencing.
Option C) Configuration management - This option is correct because configuration management is a discipline that focuses on identifying, organizing, and controlling the configuration items (such as documents, software, hardware, etc.) throughout their lifecycle. It provides a systematic approach to managing changes, version control, and ensuring the integrity and traceability of configuration items. By implementing configuration management practices, the test group can ensure that all documents and software items are referenced unambiguously.
Option D) Requirements traceability matrix - This option is incorrect because a requirements traceability matrix is a tool used to trace requirements throughout the development and testing process. While it can facilitate traceability and help ensure that requirements are met, it does not provide the ability to reference all documents and software items unambiguously.
The correct answer is C) Configuration management. This option is correct because configuration management provides the test group with the ability to reference all documents and software items unambiguously by implementing systematic practices for managing changes, version control, and traceability.