* A is correct because custom code is adjusted in System Conversion and developed in New Implementation of SAP S/4HANA in the Realize phase. In System Conversion, the existing custom code needs to be adapted to run on SAP S/4HANA. In New Implementation, new custom code needs to be developed to meet the customer's specific requirements.
* D is correct because data is converted in System Conversion and migrated in New Implementation of SAP S/4HANA in the Realize phase. In System Conversion, the existing data needs to be converted to the new data structures and formats of SAP S/4HANA. In New Implementation, new data needs to be migrated from the legacy system or other sources to SAP S/4HANA. Verified References:
* : SAP Activate Project Management Certification Guide, page 127

* A is correct because technical dependencies are one of the criteria that the product owner uses to sequence the backlog. Technical dependencies are the relationships between user stories that affect their order of implementation. For example, some user stories may require other user stories to be completed first, or some user stories may have a common prerequisite or constraint.
* C is correct because business priority are one of the criteria that the product owner uses to sequence the backlog. Business priority is the measure of how important and valuable a user story is for the customer and the stakeholders. The product owner decides which user stories are more urgent and beneficial, and places them higher in the backlog. Verified References:
* : Product Backlog

* Shell Conversion is preferred when a customer wants to keep most of their original processes and migrate to SAP S/4HANA Cloud, private edition. It involves creating a shell system that contains the configuration and master data of the source system, and then migrating the transactional data to the target system. Verified References:
* : SAP Activate Project Management Certification Guide, page 128

* A is correct because the scrum board is a tool that helps to visualize the team progress and status of the user stories in each sprint. It shows the movement of the user stories from the product backlog to the done column, indicating the completion of the sprint goal. Verified References:
* : SAP Activate Project Management Certification Guide, page 113