A Kalan zam Variables a and bare created by np. array([[5,2,1],[1, -2,011) b = np.array([l-1], [-2], [21]) Select the correct answer: O A. Variable b has 3 columns O B. Variable a has 2 columns (c. Variable b is a column vector D. Variable a has 3 rows E. Variable a is a vector Seimi Sfrla