We find the JMSRedelivered header set for a particular message on the receiver. In which two scenarios is this expected to happen? (Choose two.) 

Answer options:

A. The application has already received the message, but did not acknowledge it.
B. The session’s recover() method was called to restart the session beginning after the last acknowledged message.
C. The sender calls the redeliver() method for the message.
D. The sending application crashes after sending the message.

AB

A: The JMSRedelivered property specifies a flag set when a message is redelivered because no acknowledge was received. This flag is of interest to a receiving application. If set, the flag indicates that JMS may have delivered the message previously because one of the following is true: * The application has already received the message, but did not acknowledge it. * The session`s recover() method was called to restart the session beginning after the last acknowledged message. Reference: http://docs.oracle.com/cd/E12840_01/wls/docs103/jms/fund.html