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The ISO standard that was updated at the end of 2015 is ISO 9001. This standard focuses on quality management systems (QMS) and is widely recognized globally as a framework for organizations to ensure they consistently meet customer and regulatory requirements. The 2015 revision introduced a number of changes aimed at improving the integration of the standard into the organization's strategic planning and overall management systems. Key updates included a greater emphasis on leadership and commitment from top management, a stronger focus on risks and opportunities, and encouragement for a process-oriented approach to enhance efficiency.

Considering the other standards, ISO 14001 deals with environmental management systems and was also revised in 2015, but it is not the standard being directly asked about in this context. ISO 26000, which provides guidance on social responsibility, does not have a certification mechanism and has not had a major update in that timeframe. Meanwhile, ISO 50001 regarding energy management systems was revised in 2018. Thus, among the options, ISO 9001 is indeed the correct choice for the standard that was specifically updated at the end of 2015.