Which three statements are true about sequences in a single instance Oracle database?

Which three statements are true about sequences in a single instance Oracle database? (Choose three.)
A. A sequence can issue duplicate values
B. A sequence’s unallocated cached value are lost if the instance shuts down
C. Sequences can always have gaps
D. Two or more tables cannot have keys generated from the same sequence
E. A sequence can only be dropped by a DBA
F. A sequence number that was allocated can be rolled back if a transaction fails

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