Vector Dot Product Choose one . 4 points If a = (-2, 1, 5) and b = (1, 2, 1) , calculate a . b O a . b - 5 O a . b = ( - 2, 2, 5 ) O a . b = 9 QUESTION 9 Basis of a Matrix Row Space Choose one . 4 points 3 Find the basis of row space of matrix A = 1 dim [rowsp( A)] CT N 5 co and rank ( A) O basis - {(1, 3, 1), (0, 5, 1) }, dim [rowsp( A)] = 2, rank(A) = 2 O basis - {(1, 3, 1), (0, 5, 1), (0, 0, 0) }, dim [rowsp( A)] = 3, rank(A) = 3 O basis - {(1, 3, 1), (2, 1, 1), (5, 5, 3)}, dim[rowsp( A)] = 3, rank( A) = 3