QUESTION 6 10.00000 p A NumPy array a contains both numbers and nans. Hows does the function numpy.sort (a with the default parameters handle the nans? The nans are moved to the end of the array The function raises an exception. The nans are moved to the beginning of the array. The nans are discarded from the array QUESTION 7 10.00000 p What is used by NumPy to represent a missing value? O numpy.na None numpy.nan O An empty string