设A到B的函数为f:x→y=2x+1,B到C的函数f2:y→z=y2-1,则A到C的函数f是( )
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A.f:z→4x(x+1) B.f:z→2x2-1 C.f:z→2-x2 D.f:z→4x2+4x+1