Which operation must be completed to create a hollow form from a solid shape?

To create a hollow form from a solid shape, the shell operation is essential. This function removes material from the interior of the solid while maintaining a defined wall thickness, effectively transforming a solid object into a hollow one. The shell command allows for greater design flexibility and helps achieve specific geometric characteristics that might be necessary for the application, such as weight reduction or accommodating internal features or components.

Utilizing this operation is particularly advantageous in scenarios where you want to preserve the outer dimensions of an object while modifying its internal structure. It simplifies the process of making hollow shapes, promoting design efficiency by enabling quick adjustments in thickness and form.

The other options, while functional in their own right, do not specifically accomplish the goal of transforming a solid shape into a hollow form. For example, the cut operation primarily deals with removing sections from a shape rather than creating a uniform hollow structure. Similarly, fillet refers to rounding off edges rather than altering the internal volume, and solving typically pertains to resolving constraints or calculations in a model rather than modifying its physical structure. Hence, the shell operation is the proper choice for creating hollow forms from solids.