If b is the arithmetic mean between a and x;b is the geometric mean between a′ and y;b is the harmonic mean between a and z, (a,b,x,y,z>0) then the value of xyz is ?
A
(2b−a)b3b−2a
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B
b3
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C
b3(2a−b)2b−a
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D
b3(2a−a)2a−b
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