Which three actions can you perform on an existing table containing data? (Choose three.)
A. Add a new NOT NULL column with a DEFAULT value
B. Change the default value of a column
C. Change a DATE column containing data to a NUMBER data type
D. Add a new column as the table’s first column
E. Define a default value that is automatically inserted into a column containing nulls
F. Increase the width of a numeric column
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ABF