If a 3×33 \times 33×3 system Ax=bAx = bAx=b has a unique solution, what must be true about the rank of AAA?
rank(A)<3rank(A) < 3rank(A)<3
rank(A)=3rank(A) = 3rank(A)=3
rank(A)=0rank(A) = 0rank(A)=0
rank(A)>3rank(A) > 3rank(A)>3