Solution:
Concept:
If a diameter of a circle bisects a chord, then it must be perpendicular to the chord. If a diameter of a circle is perpendicular to a chord, then it bisects the chord. If two chords are congruent, then the center is equidistant from the two chords.
The chord given in the question is
Hence,
The final answer is
It BISECTS chord DF
OPTION D is the right answer