@Kat Ensuring that an SAP system behaves as expected is crucial for maintaining operational efficiency. I believe that the best approach involves a combination of:

d) all of the above

Each type of testing plays a vital role:

• Functional Testing (STA/ECT) ensures that the system meets business requirements and performs the necessary functions correctly.
• Performance Testing (EPT) helps identify any bottlenecks and ensures the system can handle the expected load without issues.
• Data Integrity Testing (EDIT) verifies that the data remains accurate and consistent throughout the system.

By integrating all these testing methodologies, we can achieve a comprehensive assessment of the SAP system's performance and reliability.

All of the above

With none. A demonstration of some cases, does not mean the product is right in all cases.
“behaves as expected” is a very bold claim I would not make.

Sure, I can provide knowledge and some certainty about what I covered what I test. But not 100%.

Also expectations can be faulty. Especial the documents. And sometimes its a journey to find out what people really need.

500. all of the above 

4. all of the above!

d)