1. To effectively redesign the app ecosystem, the designer must consider all stakeholders who interact with the app.
- Option A: People who deliver food through the app provide valuable insights about usability and challenges faced during delivery.
- Option B: Employees of restaurants offering food through the app can share their experience with the app's integration and usage.
- Option C: Customer support employees deal directly with user complaints and technical issues, offering insights into recurring problems and areas for improvement.
- Option D: Existing users are the primary consumers of the app, and their feedback is critical for understanding user experience and expectations.
Conclusion: To gain a holistic view, the designer should interview all the mentioned groups, making the correct options \(A, B, C, D\).