Which one of the following statements about the structure of the TOGAF 9 document is true?

Part I of the TOGAF 9 document, titled 'Introduction', provides an overview of the TOGAF approach to Enterprise Architecture, including its core concepts and key definitions, setting the foundational understanding for the entire framework.

Part II of TOGAF 9 is the 'Architecture Development Method (ADM)', which is the core process for developing an enterprise architecture, not definitions and version changes.

Part III of TOGAF 9 is the 'ADM Guidelines and Techniques', which provides detailed guidance on adapting and applying the ADM, not solely requirements management, and Part II (ADM) is considered the core.

Part IV of TOGAF 9 is the 'Architecture Content Framework and Metamodel', which describes the outputs of the ADM, while the ADM itself is described in Part II.