When a Datum Feature Symbol and a Feature Control Frame

When a datum feature symbol and a feature control frame are combined, ____.

A) the datum feature symbol is shown at the right end of the feature control frame
B) the datum feature symbol is shown at the base of the feature control frame
C) the datum feature symbol is shown at the left end of the feature control frame
D) the datum feature symbol is shown at the center of the top of the feature control frame
E) none of the above