Key business stakeholders have asked for a new business requirement that requires a multi-cloud solution...

These answers are correct because they are actions that a Solution Architect should take to accurately capture the requirements for a multi-cloud solution design. Including functional and technical experts across discovery workshops can help ensure that the requirements and priorities are captured from different perspectives and domains. Drafting a requirements and process document can help document the business needs, expectations, and constraints for the solution design. Inviting key business and technical/design team stakeholders to review and approve the document can help validate the requirements and ensure alignment. References: https://trailhead.salesforce.com/en/content/learn/modules/solution-design/solution-design-process