Which command is used to push firmware from the master unit to all units in a stack of Dell switches?

The command that is used to push firmware from the master unit to all units in a stack of Dell switches is accurately reflected by the choice that involves providing an instruction to copy the image to all the units. This command functions by directing the master unit to distribute its current firmware image across all stack members.

Using this command is essential in a stacked environment to ensure consistency in firmware versions across all switches, which in turn aids in maintaining network stability and reliability. It eliminates the need for individual updates on each switch, streamlining the process and reducing potential human error.

The other options, while they may sound plausible, either reference incorrect syntax, suggest functionalities that don't align with the necessary firmware management processes, or pertain to commands that do not effectively achieve the desired goal of syncing the firmware across all switches in a stack.