For the following parameterized curve, find the unit tangent vector. r(t) = (e 3t,3 e 3t,3...

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For the following parameterized curve, find the unit tangent vector. r(t) = (e 3t,3 e 3t,3 e -11), for t20 Select the correct answer below and, if necessary, fill in the answer boxes within your choice. O A. T(t) = ( D (Type exact answers, using radicals as needed.) B. Since r'(t) = 0, there is no tangent vector. For the following parameterized curve, find the unit tangent vector. r(t) = (e 3t,3 e 3t,3 e -11), for t20 Select the correct answer below and, if necessary, fill in the answer boxes within your choice. O A. T(t) = ( D (Type exact answers, using radicals as needed.) B. Since r'(t) = 0, there is no tangent vector.