Sales details are being stored

单项选择题 Sales details are being stored on a daily basis in the SALES_2007 table. A large amount of data is added to the table daily. To save disk space, you issued the following command: ALTER TABLE sales_2007 COMPRESS FOR ALL OPERATIONS; What would be the outcome of this command?（）: A、It produces an error because data already exists in the table.; B、It produces an error because compression can be enabled at table creation only.; C、It compresses all data added or modified henceforth but the existing data in the table is not compressed immediately.; D、It immediately compresses all existing data as well as new data, resulting from either fresh additions or modifications to existing data.

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