Which is the most plausible explanation?

You monitor a running JMS topic with the console and note the following values:
Consumers Current = 3
Message Current = 1
Message Pending = 0
These values do not change for several minutes. Which is the most plausible explanation?

A.
Production on the topic has been paused.

B.
A message arrived after a durable subscribe disconnected from the topic.

C.
One of the consumers received a message but did not acknowledge it.

D.
None of the consumers are durable subscribes.

Explanation:
For durable subscriptions, WebLogic JMS stores a message in a persistent file or
database until the message has been delivered to the subscribers or has expired, even if those
subscribers are not active at the time that the message is delivered.
Note #1: Durable subscriptions means that weblogic server will store the messages in a persistent
store (i.e a file-store or a JDBC-store) until those messages are delivered to the
subscribers/listener. This technic helps weblogic server to make sure that the messages get
delivered even if those subscribers/listeners are not active at the time that the message is getting
delivered.
As all of us know that in Topic’s the senders/producers just send the messages to the topic and
the receivers/listeners have subscribe them self to get those messages, hence senders/producers
does not have any concern if the messages are been received or not. However with this feature
weblogic make sure all the subscribers would get the messages as the messages gets stored in a
persistence store.

Note #2:
* Consumers Current Count: Current number of consumers accessing this destination
* MessagesCurrentCount: The current number of messages in the destination. This does not
include the pending messages.
* MessagesPendingCount: The number of pending messages in the destination.
Pending messages are over and above the current number of messages. A pending message is
one that has either been sent in a transaction and not committed, or that has been received and
not committed or acknowledged.
Reference: eDocs Home > BEA WebLogic Server 8.1 Documentation > Programming WebLogic
JMS > Developing a WebLogic JMS Application, Setting Up Durable Subscriptions