Apple Certified Support Professional Practice Test

To change the orientation of the dock in macOS, the command that specifies the desired position utilizes the defaults write command, setting the orientation to either 'left', 'right', or 'bottom'. Using 'orientation left' effectively positions the dock vertically on the left side of the screen.

This command is consistent with macOS's preferences for dock customization, where users can specify how they want their dock to appear based on their workspace requirements. In this context, choosing 'left' indicates a clear understanding of how to adjust the user interface to prioritize screen real estate or personal preference for navigation of applications.

The other commands would achieve similar results but position the dock in different orientations: 'right' places it on the right side, and 'bottom' keeps it at the default bottom location. However, since the question specifically asks for changing the dock orientation to the left, this command is the correct one in that context.