Your developers have created table to store some of their program’s data. After examining the slow Query Log, you see that they are using the LIKE operator and SUBSTER () functions against a VARCHAR (10000) column quite often. An example of the start of one row of data: ‘GREEN01020495888331993-12-10/2…’ What should you do to improve the overall performance? A. Convert the column to TEXT and add a fulltext index to the table. B. Create multiple prefix indexes of differing lengths. C. Convert their column to BINARY. D. Redesign the table so that the most commonly searched for string patterns are in their own columns. 答案:D