Which line type typically indicates the termination point of a dimension line?

The correct answer indicates that an extension line is used to denote the termination point of a dimension line in technical drawing. Extension lines are thin lines that extend from the edges of the object being measured to the dimension line itself. They are crucial in providing a clear and accurate indication of where the dimensions apply on the drawing, ensuring that there is no confusion about the features or sections being referenced.

Extension lines help in maintaining clarity, as they visually connect the dimension to the relevant part of the drawing. This connection is essential for understanding the sizes of the features being dimensioned and how they relate to each other in the design.

In contrast, center lines generally indicate symmetry and the axes around which shapes may be symmetrical, but they do not mark termination points of dimensions. Leader lines are used to connect a specific note or dimension to a particular feature but don't serve the purpose of marking where dimensions end. Cut lines indicate where an object should be cut for a section view but are not relevant to dimension lines. Understanding the role of different line types in technical drawings is key for creating clear and functional representations of designs.