Which task can be performed by using a single Data Manipulation Language (DML) statement?

Which task can be performed by using a single Data Manipulation Language (DML) statement?
A. Removing all data only from a single column on which a primary key constraint is defined.
B. Removing all data from a single column on which a unique constraint is defined.
C. Adding a column with a default value while inserting a row into a table.
D. Adding a column constraint while inserting a row into a table.

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