Cloud-initis an initialization and configuration system designed primarily forLinux-based cloud instances.
According to official cloud-init documentation, it is supported on a wide range of Linux distributions, including Ubuntu, Red Hat Enterprise Linux, CentOS, Debian, and SUSE.
Windows systems use a separate project calledCloudbase-Init, which is not cloud-init itself. macOS and Android do not support cloud-init.
Therefore, the correct answer isC (Linux).