Which statement about expression-based indexes is true?
A. The RUNSTATS command cannot be used to collect statistics for expression-based indexes.
B. Expression-based indexes must always be defined as UNIQUE to prevent duplicate index keys.
C. Expression-based index keys consist of a concatenation of one or more specified table columns.
D. The index key values of expression-based indexes are not the same as the values in the corresponding table columns.
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