Question from the Agile test

It is to ensure that the sizing of an IT system is always adapted so that it is 100% available to users.

It is to define Service Level Indicators (SLI), Aggrement (SLA) and Objectives (SLO) to deliver Super Rentable Exprience (SRE) to users.

It is the fact of tracing each of the anomalies encountered by a development team or end users in a bug tracking system like Jira.

It is to allow finding a balance between launching new features and ensuring their reliability for users.