Let u(t) = 7t³i + (t²-9) j-7k and v(t) = ei + 3e j - e³tk. Compute the derivative of the following function. u(t). v(t) Select the correct choice below and fill in the answer box(es) to complete your choice. OA. The derivative is the vector-valued function()i+Oj+Ok B. The derivative is the scalar function

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