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A chord, in music, is any harmonic set of usually three or more notes (also called pitches) that is heard as if sounding simultaneously. In everyday use by musical ensembles such as bands and orchestras, the three or more notes of a chord are often sounded together.
A chord is a line which touches two points on the circle where as diameter is a line which touches two points on the circle but passes through the center of a circle so diameter can be alse called chord but chord can not be called diameter because it doesnot pass through center.so right option is C. A diameter is always a chord. Report.