Which of the following expressions equals the scalar triple product a⋅(b×c)\mathbf{a} \cdot (\mathbf{b} \times \mathbf{c})a⋅(b×c)?
b⋅(c×a)\mathbf{b} \cdot (\mathbf{c} \times \mathbf{a})b⋅(c×a)
a⋅(c×b)\mathbf{a} \cdot (\mathbf{c} \times \mathbf{b})a⋅(c×b)
(a⋅b)×c(\mathbf{a} \cdot \mathbf{b}) \times \mathbf{c}(a⋅b)×c
a×(b⋅c)\mathbf{a} \times (\mathbf{b} \cdot \mathbf{c})a×(b⋅c)