(b) Let r(t)-ti- +(4-t) k, then the vector equation of the line tangent to the graph of r(e) at the point (4, 1,0) on the curve is A.r-(4i +j) + t(-4i+j+4k) B.r-(4i-3)+ t(-41 +j+ 4k) Cr-(4i+j) + t(4i +j+ 4k) D.r (4i+5) + t(-4i +j-4k)

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