A user requires more storage space on their computer. After a technician installs a second IDE drive in the computer, the system will not recognize that there are any hard drives installed. Which of the following is the MOST likely cause of the problem?（）

A. The second hard drive has not been formatted for NTFS.
B. The jumpers on both drives are set to the cable select position.
C. The jumper on the first drive is set to master and the second is set to slave.
D. The jumpers on both drives are set to the master position.