* B is correct because String test > Integration Test > User Acceptance Test is the best outline of the sequence of testing in the Realize phase. The String test is performed first to verify the end-to-end processes across the system landscape. The Integration Test is performed next to verify the integration of the solution with other systems and interfaces. The User Acceptance Test is performed last to verify that the solution meets the customer's business requirements and expectations. Verified References:
* : SAP Activate Project Management Certification Guide, page 120

Definition of Done is the information that the project team needs before they can correctly estimate the relative size of backlog user stories. Definition of Done is a set of criteria that determines when a user story is considered complete and ready for acceptance by the product owner. It helps the team to align their expectations and assumptions on each user story, and provide consistent and reliable estimates.

* A is correct because SAP Readiness Check in system conversion covers the area of recommended SAP Fiori apps, which are apps that are suggested by SAP based on the customer's current usage of SAP GUI transactions.
* C is correct because SAP Readiness Check in system conversion covers the area of sizing for SAP S/4HANA, which is an estimation of the hardware and software resources required to run SAP S/4HANA based on the customer's current system data.
* E is correct because SAP Readiness Check in system conversion covers the area of simplification database, which is a collection of simplification items that describe the changes and adaptations required for SAP S/4HANA compared to the previous SAP ERP releases. Verified References:
* : SAP Readiness Check 2.0 for SAP S/4HANA

* D is correct because Sandbox is the system that is recommended to demonstrate standard functionality in the Explore phase when doing a new implementation on premise or private cloud. The Sandbox system is a copy of the Development system that can be used for demonstration, exploration, and testing purposes. It allows the project team to show the customer the SAP Best Practices content and compare it with their business requirements. Verified References:
* : SAP Activate Project Management Certification Guide, page 124

* A is correct because SAP Connectivity service is one of the tools that facilitate secure communication between SAP cloud solutions and protected on-premise networks that cannot be accessed directly from the Internet. The SAP Connectivity service allows SAP cloud applications to access remote services that run on the Internet or on-premise via a secure tunnel established by the Cloud Connector. The Cloud Connector acts as a reverse proxy that connects to the SAP Connectivity service and exposes the on-premise systems to the cloud applications. Verified References:
* : Connectivity Service
* : SAP Cloud Platform Service: Connectivity