Final answer:
The command option for drawing rectangles with a specific line thickness is found in the stroke or outline settings in graphic design and CAD programs, where you can set the border width for precise design work.
Step-by-step explanation:
The command option designed for drawing rectangles with a specific line thickness in many graphic design and CAD (Computer-Aided Design) programs is often found in the stroke or outline settings. When you select the rectangle tool, you typically have the option to set the line thickness before drawing. This feature is essential for designers who need precision in their work, such as specifying the border width for a shape in a technical drawing or creating visual elements in a graphic design project.