What is the locus of the midpoints of all chords of length 6cm within a circle of radius 5cm and with centre 0

A.
A circle of radius 4 cm and with centre O 
B.
The perpendicular bisector of the chords 
C.
a straight line passing through centre O 
D.
A circle of radius 6 cm and with centre O
Correct Answer: Option A
Explanation
The locus of the midpoint of all chords of length 6cm within a circle of radius 5cm and with centre O is the perpendicular bisectors of the chords.