What type of boot method can be particularly useful during development when the root filesystem changes frequently?

The option that is particularly useful during development when the root filesystem changes frequently is the NFS boot method. NFS, or Network File System, allows a system to boot from a networked server rather than relying on local storage. This method is advantageous in a development environment because it facilitates rapid updates and changes to the root filesystem without the need to physically alter each individual machine.

When using NFS booting, the root filesystem can reside on a central server, and multiple client systems can access this filesystem over the network. As developers make changes—such as updating software, configurations, or other files—those changes are instantly reflected across all client machines. This approach simplifies the development workflow and reduces the administrative overhead associated with managing multiple local installations.

In contrast, local boot would require updates to be applied on each machine individually, which can be slow and resource-intensive. Diskless booting, while also leveraging network resources, typically refers to booting clients that do not have local storage and might not offer the same flexibility for frequent filesystem changes as NFS. USB booting involves using removable storage, which is less efficient for rapid and widespread updates across multiple systems.