Where are the transactions committed in the flow?

A flow started from an MQInput Node has multiple database interactions from Compute, Java Compute and Map Nodes. All relevant node transactional properties are set to automatic. XA is not configured. Where are the transactions committed in the flow?
A. Both databases and the MQ transactions are committed at the end of the flow.
B. MQ transactions are committed at the end of the flow but each database interaction is committed as the message is propagated from the Out terminal.
C. Since there is only one MQ Node the MQ transaction is committed while propagating from the Out terminal of the MQInput Node and all the database interactions are committed at the end of the flow.
D. Each of the nodes mentioned has a Transaction property to determine the transactional nature of the node and is always committed when propagating from the Out terminal independent of any other Nodes in the flow.

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