Which of the following are essential rules of the SAP S/4HANA Cloud extensibility model?

The correct choice highlights a fundamental principle of the SAP S/4HANA Cloud extensibility model, which is maintaining a clear separation between any extensions created by the customer and the standard code provided by SAP. This separation ensures that any custom logic or functionalities are independent of SAP's core systems, enabling easier upgrades and maintenance. Such an architecture minimizes the risk of unintended consequences on the standard functionality, thereby ensuring that standard updates by SAP do not affect customer-specific extensions.

The adherence to this principle also facilitates a smoother collaborative relationship between SAP and customers, as customers can adapt and innovate their business processes without jeopardizing the integrity of the SAP system. Additionally, this segregation limits complications during system upgrades, as updates to the core system will not disrupt customized functionalities, leading to reduced downtime and operational impacts during upgrade cycles.

In contrast, options addressing modifications of SAP objects or standard modifications do not align with the extensibility model, as they may undermine the stability and support provided by SAP to its cloud solutions. The suggestion regarding customer upgrade frequency is less relevant to the core principles of extensibility and software maintenance strategy emphasized by SAP for cloud solutions.