Which of the following vectors is NOT a valid scalar multiple of v=⟨2,4⟩\mathbf{v} = \langle 2, 4 \ranglev=⟨2,4⟩?
⟨1,2⟩\langle 1, 2 \rangle⟨1,2⟩
⟨−4,−8⟩\langle -4, -8 \rangle⟨−4,−8⟩
⟨3,6⟩\langle 3, 6 \rangle⟨3,6⟩
⟨2,6⟩\langle 2, 6 \rangle⟨2,6⟩