Python: The NumPy array

1. What is the output of the following code?

x=np.array(11) x.shape 

a. (1)

b. ()

c. Error message since xx is not an array

2. Consider the following array

np.array([[1],[2],[3],[4]]) 

a. it is a one-dimensional array with shape (4)

b. it is a two-dimensional array with shape (1,4)

c. it is a two-dimensional array with shape (4,1)

d. it is a four-dimensional array with shape (1,1,1,1)