A business case is a document that outlines the rationale, objectives, benefits, costs, risks and alternatives of a proposed IT project. A business case should be reviewed periodically throughout the project life cycle to ensure that the project is still aligned with the enterprise's strategy and goals, and that the expected benefits are still achievable and realistic. A periodic review of the business case can also help to identify any changes or issues that may affect the project's scope, schedule, budget or quality, and to take corrective actions accordingly. References: ISACA, CGEIT Review Manual, 7th Edition, 2019, page 77. A guide to measuring benefits effectively. Cost-Benefit Analysis: A Quick Guide with Examples and Templates.

Ensuring that the system is maintained in compliance with enterprise architecture (EA) standards is the most effective way to prevent an IT system from becoming technologically obsolete before its planned return on investment (ROI), because it ensures that the system is aligned with the current and future business needs, goals, and strategies of the organization. Enterprise architecture (EA) standards define the principles, guidelines, and best practices for designing, developing, and managing IT systems in a consistent, coherent, and integrated manner across the organization. By following EA standards, IT leaders can ensure that the system is compatible with the existing and emerging technologies, platforms, and frameworks that support the business processes and functions. EA standards also help IT leaders to monitor and evaluate the performance, quality, security, and reliability of the system, and to identify and address any gaps, issues, or risks that may affect its functionality or value. EA standards also facilitate the communication and collaboration among different stakeholders involved in the system lifecycle, such as business users, IT staff, vendors, and auditors. By maintaining the system in compliance with EA standards, IT leaders can ensure that the system delivers the expected benefits and value to the organization and achieves its planned ROI. Reference:= ISO/IEC/IEEE 42020:2019(en), Software, systems and enterprise ? Architecture processes, Sample: Enterprise Architecture Standards - CIO Portal, Obsolescence management for IT leaders - Information Age

The enterprise's data owner retains accountabilityfor the governance of data retention, even when the data is transferred to a third party. Outsourcing does not eliminate governance responsibilities; the data owner must ensure compliance with policies, regulations, and contractual terms, including how long data is retained and under what conditions.
While third parties execute controls,the enterprise remains accountable for the data and its governance outcomes.
Reference:
CGEIT Review Manual: Domain 2 - IT Resources, Data Governance
COBIT 2019: DSS01 (Manage Operations), APO10 (Manage Suppliers).

This should be the committee's first recommendation, as it will help to identify and evaluate the potential threats, vulnerabilities, and impacts of using personal smartphones to conduct corporate business1. A risk assessment will also help to determine the appropriate controls and mitigation strategies to protect the corporate information and assets, as well as comply with the relevant regulations and standards1. The other options are not as important as performing a risk assessment, as they are dependent on the outcome of this step. Documenting procedures for securing personal devices, improving training courses on securing corporate information, and updating the corporate security policy to include personal devices are possible actions that may be taken after performing a risk assessment, based on the identified risks and their levels2.