Which of the following creates a data frame? import pandas as pd df = pd.DataFrame (data= ['A': [10, 100], 'Z': [20, 400] ] ) df = pd.DataFrame (data= {'A': [10, 100], 'Z': [20, 400] }) df = pd.DataFrame (data= {'A'= [10, 100], 'Z'= [20, 400] }) df = pd.DataFrame (data= ['A'= {10, 100}, 'Z'= {20, 400} ] )