A is correct because including functional subject matter experts and technical resources across multiple discovery workshops, grouped by business function, is a best practice for capturing requirements and ensuring alignment across different stakeholders1.

B is correct because conducting discovery workshops and presenting the solution back to the design authority or executive stakeholders is a best practice for validating the solution and obtaining feedback and approval1.

C is incorrect because conducting discovery workshops to create a user acceptance testing document is not the purpose of discovery workshops. User acceptance testing documents are created after the solution design is finalized and approved2.

D is incorrect because including the customer service team to provide detailed user stories prior to the discovery workshops is not necessary. User stories are created during the discovery workshops based on the business requirements and pain points identified by the stakeholders1.

References:

1: https://trailhead.salesforce.com/content/learn/modules/om-salesforce-order-management/om-discovery-workshops

2: https://t railhead.salesforce.com/content/learn/modules/om-salesforce-order-management/om-user-acceptance-testing