Find the length of the curve r(t)=⟨3cost,3sint,4t⟩\mathbf{r}(t) = \langle 3\cos t, 3\sin t, 4t \rangler(t)=⟨3cost,3sint,4t⟩ for 0≤t≤2π0 \leq t \leq 2\pi0≤t≤2π.
5π5\pi5π
10π10\pi10π
6π6\pi6π
20π20\pi20π