A VDU is hardware.
Since IRIX was discontinued in 2006 and the hardware for SGI uses other Linux distributions it is doubtful that you will find any anti-virus software for this OS.
Yes, Unix is system software. It is a kind of operating system.
It is possible to use BSD software on Unix systems. It is possible but many do not and they use other softwares on Unix systems beside the BSD software.
Operations Management Software is software to help a person oversee, and control the production process of the facility. The software organizes these processes to make the job run smoother.
Unix can be run on a variety of server, mainframe, and workstation devices.
A scanner is both hardware and software, the device itself is hardware (all devices are hardware) but the driver(a program) that runs it is software.
hardware
see: What_is_the_cost_of_a_Unix_server
A microphone is hardware. Software is what programs and games are called.
both a hardware and software
Motherboards are hardware components, not software.