If r(t)=⟨t,t2,t3⟩\mathbf{r}(t) = \langle t, t^2, t^3 \rangler(t)=⟨t,t2,t3⟩, what is the velocity at t=1t=1t=1?
⟨1,1,1⟩\langle 1, 1, 1 \rangle⟨1,1,1⟩
⟨1,2,3⟩\langle 1, 2, 3 \rangle⟨1,2,3⟩
⟨0,2,6⟩\langle 0, 2, 6 \rangle⟨0,2,6⟩
⟨1,2,1⟩\langle 1, 2, 1 \rangle⟨1,2,1⟩