Enterprise data governance is a system for defining who within an organization has authority and control over data assets and how those data assets may be used. It encompasses the people, processes, and technologies required to manage and protect data assets1. Enterprise data governance can help address the inconsistencies in data classification by establishing a common framework, standards, and policies for data quality, security, and usage across the enterprise. It can also assign roles and responsibilities for data owners, stewards, and custodians to ensure accountability and compliance234.
2: https://www.ibm.com/topics/data-governance
1:
https://www.cio.com/article/202183/what-is-data-governance-a-best-practices-framework-for-managing-d
3: https://www.sailpoint.com/identity-library/enterprise-data-governance/
4: https://atlan.com/enterprise-data-governance/

The first governance action for implementing a BYOD program should be to assess the BYOD risk. This is because BYOD introduces various security, legal, and operational risks to the enterprise, such as data loss or leakage, unauthorized access, malware infection, compliance violation, device management, and user privacy. Assessing the BYOD risk can help to identify and evaluate the potential threats, vulnerabilities, and impacts of allowing employees to use personal devices for email. Assessing the BYOD risk can also help to determine the appropriate controls and mitigation strategies to reduce the risk to an acceptable level.
Assessing the enterprise architecture (EA) is not the first governance action, as it is a subsequent step after assessing the BYOD risk. EA is a framework that defines the structure, components, relationships, and principles of the enterprise's IT environment. Assessing the EA can help to ensure that the BYOD program aligns with the enterprise's vision, strategy, goals, and standards. However, assessing the EA does not address the specific risks associated with BYOD.
Updating the network infrastructure is not the first governance action, as it is an implementation step after assessing the BYOD risk and EA. Updating the network infrastructure can help to enhance the performance, reliability, scalability, and security of the network that supports the BYOD program. However, updating the network infrastructure does not provide a comprehensive risk assessment or governance framework for BYOD.
Updating the BYOD policy is not the first governance action, as it is a result of assessing the BYOD risk and EA. A BYOD policy is a document that defines the rules, guidelines, and responsibilities for employees who use personal devices for email. Updating the BYOD policy can help to communicate the expectations and requirements for BYOD users and enforce compliance and accountability. However, updating the BYOD policy does not provide a thorough risk analysis or architectural alignment for BYOD.

The most important consideration when defining an information architecture is access to and exchange of information. Information architecture (IA) is the process of guiding users through the site by organising and arranging all the relevant content in a clear, intuitive way1. The main purpose of IA is to help users find information and complete tasks2. To do this, IA needs to consider how users access and exchange information within the digital product or service, and how to make it easy, fast, and satisfying for them. Access to and exchange of information involves aspects such as:
Navigation systems: How users browse or move through information2. Navigation systems should be consistent, predictable, and visible, and should provide feedback and orientation cues to the users3.
Search systems: How users look for information2. Search systems should be accurate, relevant, and comprehensive, and should support different types of queries and filters4.
Labelling systems: How information is represented and classified2. Labelling systems should use clear, concise, and meaningful words that match the users' expectations and vocabulary.
Information structure: How information is organised into categories, hierarchies, and relationships2.
Information structure should reflect the users' mental models and tasks, and should avoid unnecessary complexity or ambiguity.
By considering access to and exchange of information when defining an IA, the organization can ensure that the information assets are usable, findable, and accessible to the users, and that they support the user experience and the business goals. References: Information Architecture Basics | Usability.gov1, What is information architecture? - UX Design Institute2, Navigation Design Basics: Tips & Best Practices - Adobe XD Ideas3, Search System Design: Best Practices & Tips - Adobe XD Ideas4, Labeling Systems: An Introduction to Information Architecture - Boxes ..., Information Architecture 101: Techniques and Best Practices - Adobe ...