The correct answer is B. 8.
A SCSI bus can support up to 8 devices, including the SCSI host adapter. The SCSI host adapter is a device that connects the SCSI bus to the computer. It is responsible for sending and receiving data to and from the SCSI devices.
The SCSI bus is a parallel bus, which means that it has multiple data lines. This allows it to transfer data to and from multiple devices at the same time. The SCSI bus is also a synchronous bus, which means that it uses a clock signal to synchronize the data transfer. This ensures that the data is transferred accurately and reliably.
The SCSI bus is a popular choice for connecting storage devices to computers. It is supported by a wide range of devices, including hard drives, CD-ROM drives, and tape drives. The SCSI bus is also supported by a wide range of operating systems, including Windows, macOS, and Linux.
Here is a brief explanation of each option:
- Option A: 1. This is incorrect because a SCSI bus can support up to 8 devices.
- Option B: 8. This is the correct answer because a SCSI bus can support up to 8 devices.
- Option C: 20. This is incorrect because a SCSI bus can support up to 8 devices.
- Option D: 10. This is incorrect because a SCSI bus can support up to 8 devices.
- Option E: All of the above. This is incorrect because only option B is correct.