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Select ‘NORTH’, CUSTOMER From CUST_DTLS Where REGION = ‘N’ Order By CUSTOMER Union Select ‘EAST’, CUSTOMER From CUST_DTLS Where REGION = ‘E’ Order By CUSTOMER The above is a) Not an error b) Error – the string in single quotes ‘NORTH’ and ‘SOUTH’ c) Error – the string should be in double quotes d) Error – ORDER BY clause