Correct Answer: The following are the usages of the Command object in AD0NET: The Command object in AD0NET executes a command against the database and retrieves a DataReader or DataSet object => It also executes the INSERT, UPDATE, or DELETE command against the database => All the command objects are derived from the DbCommand class => The command object is represented by two classes: SqlCommand and OleDbCommand => The Command object provides three methods to execute commands on the database: => The ExecuteNonQuery() method executes the commands and does not return any value => The ExecuteScalar() method returns a single value from a database query => The ExecuteReader() method returns a result set by using the DataReader object
