What is the purpose of Vertica’s transaction model? (Select three.)

A.
Transactions mean that undo logs are not needed.

B.
Transactions are used to maintain partitions.

C.
Transactions are only written upon an explicit commit being issued.

D.
Transactions are used for data recovery.

E.
Transactions are used to delete data.

F.
Transactions are used to maintain segmentation.

Explanation: