Which extrude limit requires a face to be selected?

The option that requires a face to be selected is the extrude limit "Until Extended." This extrude method starts from the selected profile and extends the extrusion until it reaches a specified face or object in the model. The nature of this limit is to define the end of the extrusion by the geometry of existing features, so it necessitates selecting a face to determine the appropriate stopping point.

In contrast, the other options operate differently. "Value" uses a numeric input to specify the exact distance of the extrusion without needing a reference face. "Through All" allows the extrusion to pass through all encountered geometry until it exits on the opposite side but does not require a specific face to be chosen. "Until Next" requires the selection of a face, but that face is the next solid that the extrusion interacts with rather than an arbitrary face chosen like in "Until Extended."