When configuring a custom log file on a production publish instance, first, the Web Console URL http://<aemhost>:<port>/system/console/slinglog provides information about Sling Logging, making it a helpful resource for managing and viewing logs (Option A). Second, creating a run mode based on Apache Sling Logging Logger configuration for publish run mode as org.apache.sling.commons.log.LogManager.factory.config-<identifier> is a standard approach to appropriately configure logging based on the environment (Option C). Starting with the log level DEBUG on a production server is generally not advisable due to potential performance impacts and excessive log generation, and the log file location is typically relative to the crx-quickstart folder.