Property lines are monumented on the ground at a. none of the above b. control points c. property corners d. the front of the property

The correct answer is c. property corners.

Property lines are the defined boundaries of a parcel of land, and these lines are typically marked on the ground at specific locations known as property corners. Property corners are the key reference points used in surveying to demarcate the boundaries of a piece of property. These corners may be marked by various means, including stakes, pins, or other fixtures, and are intended to provide a clear indication of the limits of ownership.

Control points are often associated with the broader surveying framework rather than individual property lines. While the front of the property does indicate a part of the boundary, it does not represent the complete picture of property lines, which include all corners around the perimeter of the property. Hence, the most precise answer is that property lines are monumented specifically at the property corners.