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A parametric curve r (t) has the property that r ″ ( t ) = (...

A parametric curve r (t) has the property that r ″ ( t ) = ( 1 , 0 , 2 t ) and r ′ (0) = (1 , − 1 , − 1) The tangent line to this curve is parallel to the xy-plane when t =

A.None of the above / The tangent line is never parallel to the xy-plane

B. 1 and -1

C. 0

D. -1

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