Which CLI command is used to upload a custom Python Wheel to object storage on DBFS?

The command used to upload a custom Python Wheel to object storage on DBFS is the 'fs' command. This command provides functionality for file system operations, allowing you to interact with the Databricks File System (DBFS). Specifically, it supports operations like uploading files from local storage to DBFS, which is essential for utilizing custom libraries or packages, such as Python Wheels, within your Databricks environment.

When you use the 'fs' command, you can specify the source file path and the destination path in DBFS, enabling the transfer of your custom Python libraries so that they can be accessed and used in your Databricks notebooks or jobs. This capability is crucial for managing dependencies and ensuring that your code runs correctly with the required packages.

The other commands serve different purposes: 'configure' is used for setting up configurations related to the CLI environment, 'jobs' is focused on managing job operations, and 'libraries' is related to library management but does not directly handle file uploads to DBFS. Thus, for uploading files specifically, the 'fs' command is the correct choice.