A server has a single failed hard drive in an array that is accessed through a hot plug backplane to ease replacement of failed drives. After replacing the drive several times， each of the replacement drives failed to power up and rebuild as the failed drive.
 Which of the following is the MOST likely cause of the failures？（）

A. The backplane has failed and needs to be replaced.
B. The array must be disbanded and recreated from a backup source to recognize the replacement drive.
C. There is a conflict with the optical drive on the server.
D. The server power supply is failing and not providing enough power for all the drives.