What information is provided by the database system check "brconnect -f check"? There are 2 correct answers to this question.

What information is provided by the database system check "brconnect -f check"? There are 2 correct answers to this question.
A . Space-critical objects
B . Hit ratio of the buffer cache
C . Tablespace fragmentation
D . Size of all tables and indexes

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Answer: A,C