Responsibility of OS developers to add new feature in existing OS are

more reliability
convenience and security
compatibility
all of the above

The correct answer is D. all of the above.

OS developers have the responsibility to add new features to existing OS in order to make them more reliable, convenient, secure, and compatible with new hardware and software.

  • Reliability: New features should be added in a way that does not introduce new bugs or instability into the OS.
  • Convenience: New features should make it easier for users to do things they need to do, such as accessing files, managing applications, and connecting to the internet.
  • Security: New features should be designed to protect users from malware and other security threats.
  • Compatibility: New features should be compatible with existing hardware and software, so that users can continue to use their devices and applications without having to upgrade.

In addition to these four main areas, OS developers may also add new features to improve performance, add new functionality, or simply make the OS more user-friendly.