If VVV is a vector space, which of the following is true for all v∈V\mathbf{v} \in Vv∈V?
1v=v1\mathbf{v} = \mathbf{v}1v=v
0v=00\mathbf{v} = \mathbf{0}0v=0
(−1)v=−v(-1)\mathbf{v} = -\mathbf{v}(−1)v=−v
v+v=0\mathbf{v} + \mathbf{v} = 0v+v=0