问题:
A . They can accept only one argument.
B . They can be nested up to only two levels.
C . They can return multiple values of more than one data type.
D . They can be used in SELECT, WHERE, and ORDER BY clauses.
E . They can modify the data type of the argument that is referenced.
F . They can accept a column name, expression, variable name, or a user-supplied constant as arguments.
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