Which of the following is true regarding the trace of a product?
tr(AB)=tr(BA)\text{tr}(AB) = \text{tr}(BA)tr(AB)=tr(BA)
tr(AB)=tr(A)⋅tr(B)\text{tr}(AB) = \text{tr}(A) \cdot \text{tr}(B)tr(AB)=tr(A)⋅tr(B)
tr(AB)=tr(A)+tr(B)\text{tr}(AB) = \text{tr}(A) + \text{tr}(B)tr(AB)=tr(A)+tr(B)
tr(AB)=0\text{tr}(AB) = 0tr(AB)=0