Software is the part of compute which can see but cannot touch. Eg. Ms Paint, games etc
Hardware is a physical parts of computer that can see and touch. Eg. CPU, Monitor, Keyboard, Mouse,Printer and Speaker
harware refers to all those parts of computer that can be touched or can be connected to the computer. eg. keyboard monitor.
software refers to the programs that controls and operates the computer hardware.
Embedded OS is an OS specifically used for embedded systems. An embedded system is a computer system with a dedicated function within a larger mechanical or electrical system, often with real-time computing constraints.
A distributed operating system is a software over a collection of independent, networked, communicating, and physically separate computational nodes. They handle jobs which are serviced by multiple CPUs.
Option (c). All the messages entering or leaving the network pass through the firewall. It examines each message and blocks those who don't meet the specified security criteria. Can be implemented as a hardware, software or a combination of both.