Standardization of technical platforms can help optimize infrastructure investments by reducing complexity, increasing interoperability, and enabling economies of scale.
References:
According to the CGEIT Review Manual 2022, one of the benefits of standardization is that it "optimizes infrastructure investments by reducing complexity and increasing interoperability and scalability." According to the Oracle article on the EA Roadmap to Rationalize, Standardize, and Consolidate IT Assets, standardized technology "yields measurable cost savings through reduced software licenses and the elimination of redundant systems and skill sets."1

The owner of data stored in an external cloud is the business leader who is most impacted by the loss of data. This is because the data owner is the person who has the accountability and authority over a specific dataset, and who is responsible for its security, quality, classification, and access control12. The data owner is usually a senior-level employee or a subject-matter expert who has the knowledge and motivation to ensure that the data is handled correctly and in compliance with policies and regulations2. The data owner is not the same as the data custodian, who is the person who implements the technical and operational measures to protect and manage the data according to the data owner's directives2. Therefore, the risk manager, the contract manager, and the vendor are not the data owners, as they do not have the final say or accountability over the data stored in the external cloud. References: What Is a Data Owner? - Firewall Times1, Data Owners vs. Data Stewards vs. Data Custodians - CPO Magazine2

Implementing an IT portfolio management policy would best enable remediation of this situation because it would help the organization to establish and adopt a process for measuring and monitoring the value of IT investments. This process would let the organization manage IT investments similarly to a financial portfolio by balancing potential returns, determining if an investment fits the business objectives, and performing a risk assessment. An IT portfolio management policy would also help to avoid overlap and duplication of IT projects by providing a clear and consistent way of prioritizing, categorizing, and aligning them with the enterprise strategy and goals. An IT portfolio management policy would also facilitate the evaluation and reporting of IT performance and benefits realization

The business manager has the primary responsibility to define the requirements for IT service levels for the enterprise, as they are the ones who understand the business needs, objectives, and expectations from the IT services. The business manager should communicate these requirements to the IT service provider, who should then design, deliver, and monitor the IT services according to the agreed service levels. The help desk, the CIO, and the business continuity vendor are not primarily responsible for defining the IT service level requirements, although they may have roles in supporting, implementing, or ensuring them. References := CGEIT Review Manual, 27th Edition, Domain 1: Governance of Enterprise IT, page 20-21.

According to the ISACA paper on IT Governance Reporting1, the most important information to include in IT governance reporting to the board of directors is the critical risks that IT faces or poses to the enterprise.
Critical risks are those that have a high likelihood and impact, and that could threaten the achievement of the enterprise's strategy, objectives and goals. Critical risks could include cyberattacks, data breaches, regulatory compliance violations, IT project failures, IT service disruptions, IT resource shortages, etc. The board of directors should be aware of the critical risks, as well as the actions taken or planned to mitigate them. The other options are not as important as critical risks, as they are more related to the operational or tactical aspects of IT, rather than the strategic or governance aspects.