For the following parameterized curve, find the unit tangent vector. r(t) = (e²,2e²t, 2e6t), for t≥ 0 Select the correct answer below and, if necessary, fill in the answer boxes within your choice. (©) A. T(t) = (¯¯¯¯¯¯¯¯ (Type exact answers, using radicals as needed.) OB. Since r'(t) = 0, there is no tangent vector.

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