Final answer:
To create a rounded edge on a 3D solid, the correct command to use is 'fillet'. This command smooths the transition between two surfaces, unlike 'chamfer' which bevels the edge.
Step-by-step explanation:
To create a rounded edge on a 3D solid, the command you would use is fillet. When working with 3D modeling software, a fillet is used to create a smooth, rounded transition between two surfaces. This is different from a chamfer, which creates a beveled edge. The offset command is typically used to create an evenly spaced parallel line or shape, and the shell command is used to create a hollowed-out version of a solid with walls of a specified thickness. The "Fillet" command is commonly used in CAD (Computer-Aided Design) software to round or fillet the edges of 3D solid objects. It allows you to specify a radius for the fillet, and the software then automatically creates a smooth, curved transition between the selected edges. This is particularly useful for enhancing the aesthetics of a design, reducing sharp corners, and improving the overall geometry of 3D models. Filleting is a fundamental operation in 3D modeling, contributing to the creation of more realistic and visually appealing objects within the digital design environment.