The correct answer is: B. An unused SCSI address.
A SCSI address is a unique number that identifies a SCSI device on a SCSI bus. When installing a SCSI CD-ROM drive, you must set the CD-ROM SCSI adapter to an unused SCSI address. This ensures that the CD-ROM drive can communicate with the other devices on the SCSI bus.
Option A, B0007, is not a valid SCSI address.
Option C, the same address as the SCSI device before the CD-ROM, is not always possible. If the SCSI device before the CD-ROM is already using an address, then you will need to choose a different address for the CD-ROM drive.
Option D, SCSI ID=1, is the default SCSI address for a SCSI CD-ROM drive. However, it is not always the best address to use. If you are using multiple SCSI devices, it is best to choose unique addresses for each device.
Option E, none of the above, is not a valid answer.