Company.com recently updated the programs used in an HACMP pre-event. The procedure Involved coping the new code over the old code in the appropriate directory on one of the nodes as indicated by the HACMP event entry. The cluster was synchronized. During a fallover test， the backup system did not behave as expected. What is the most likely problem？（）

A. The new pre-event program was node locked to a hostname
B. The new pre-event program was not made executable on al nodes.
C. The new pre-event program was not compatible with the backup machine.
D. The new pre-event program was not propagated to all the nodes in the cluster.