What causes this discrepancy?

View the Exhibit. A user has configured Mediator M1 to receive and route product
Information from System X into its internal applications in chronological order. For each
product1 M1 receives one create number of “update” events from an AQ Queue via a JMS

adapter. M1 can receive updates to the product at any time of day. The user claims that
incoming messages for each product are received and processed in the correct
chronological order 95% of the time. However, the messages are being processed out of
order 5% of the time. This results in critical errors in the target systems. The user expects all
messages pertaining to a product to be unconditionally processed In the order of arrival at
M1. What causes this discrepancy?

A.
The user is running on a four node SOA cluster and has not configured the inbound
JMS adapter to be a singleton.

B.
The user is running a single-node SOA environment but has configured the number
of inbound adapter threads to be a value greater than 1.

C.
The given Mediator configuration does not address this sequencing requirement.

D.
The user has configured resequencer worker threads to a value greater than 1 for
the Mediator service engine.

Explanation: