Which of the following is part of the build steps in SailPoint IdentityIQ?

The correct choice involves a key step in the deployment and build process of SailPoint IdentityIQ, specifically focused on ensuring a clean and functioning installation. Deleting old web applications and the IdentityIQ directory and files serves to eliminate potential conflicts or issues arising from residual files and configurations from previous versions.

When setting up a new build of IdentityIQ, it's crucial to start with a clean slate. Residual files from prior installations could contain outdated configurations, custom modifications, or even corrupted data that might interfere with the new build’s integrity and functionality. By removing these old directories and files, the system is set up to execute the new build without interference from remnants of earlier versions, leading to a more stable environment for running the IdentityIQ application.

Other options, while relevant to the overall health of the system or deployment process, do not directly pertain to the immediate build steps of IdentityIQ. Avoiding custom configurations might be more about best practices rather than a specific build step. Updating the server's operating system and running full system diagnostics are important for maintaining the operational environment but are not explicitly part of the build steps critical to IdentityIQ installation. Thus, removing old files and directories is the distinct action that ensures a successful implementation during the build phase.