Question: Let's say df is a DataFrame. How would you explain the following line of code? df [ ' ColumnName ' ] = range ( 0

Let's say df is a DataFrame. How would you explain the following line of code?
df['ColumnName']= range(0,5)
If the column ColumnName does not exist, add a new column and populate it with values 0,1,2,3,4.
If the column ColumnName does exist, update the column values to be 0,1,2,3,4.
Both options above.
Take a slice of column values with indexes 0,1,2,3,4.
None of the above.

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