Which tools are NOT used to develop an extension application for S/4HANA Cloud written in JavaScript and running in the Cloud Foundry environment?
Note: There are 4 correct answers to this question.

A call from your app to an external system is repeatedly failing. What pattern is used to detect failures and encapsulates the logic of preventing a failure from constantly recurring, during maintenance, temporary external system failure or unexpected system difficulties?

What is executed in parallel to end-to-end tests of the system?

What can also be used to achieve asynchronous and reactive programming by wrapping API calls appropriately?

Using the NestJS framework, what are features improving the developer experience?
Note: There are 3 correct answers to this question.