* B is correct because asking questions is one of the collaboration features that are available in the SAP Community. The SAP Community allows users to post questions on various topics and get answers from other users, experts, or moderators.
* C is correct because commenting on key deliverables is one of the collaboration features that are available in the SAP Community. The SAP Community allows users to comment on the key deliverables that are published by SAP or other users, such as blog posts, articles, videos, podcasts, or webinars. Verified References:
* : SAP Community Home

* A is correct because software upgrades performed by SAP are one of the characteristics that are unique to SAP S/4HANA Cloud, public edition. SAP takes care of the upgrade process and ensures that the system is always up to date with the latest features and innovations.
* D is correct because optional 3-system landscape is one of the characteristics that are unique to SAP S/4HANA Cloud, public edition. Customers can choose to have a 3-system landscape (development, quality, and production) or a 2-system landscape (quality and production) depending on their needs and preferences.
* E is correct because mandatory upgrades are one of the characteristics that are unique to SAP S/4HANA Cloud, public edition. Customers have to accept the upgrades that are delivered by SAP on a quarterly basis and cannot opt out or postpone them.

* B is correct because IMG (Implementation Guide) is a tool that can be used to perform configuration in SAP S/4HANA Cloud, private edition. It provides access to the configuration transactions and activities that are relevant for the project scope.
* C is correct because Self Service Configuration Uls (SSCUIs) are tools that can be used to perform configuration in SAP S/4HANA Cloud, private edition. They provide a user-friendly interface to configure the settings that are specific to the customer's business needs. Verified References:
* : SAP Activate Project Management Certification Guide, page 131

* B is correct because according to the Definition of Done, the solution must be built and configured in the development system (DEV) for each Sprint. This means that all user stories in the Sprint backlog must be completed, tested, and accepted by the product owner in the DEV system before moving to the next Sprint. Verified References:
* : SAP Activate Project Management Certification Guide, page 114

* D is correct because when deploying a new implementation on-premise, it is recommended to use SAP ABAP Workbench for custom development. SAP ABAP Workbench is a tool that allows developers to create, modify, and enhance ABAP programs and applications in an on-premise system. It provides various features, such as syntax check, debugging, testing, and transport management. Verified References:
* : ABAP Workbench