Which best describes what is needed to make hardware function? 1. All software must be properly licensed. 2. Application software must interact with the BIOS. 3. Different types of software must interact with each other. 4. Application software must be installed.

I'd go with C: Different types of software must interact with each other.

Application software partly or does not communicate directly with the hardware. Between applications software and hardware is an operating system. An operating system is a set of programs and is an intermediary between the computer hardware and the applications software. The operating system executes and provides services for different types of application software that interact with each other to make the hardware function and co-ordinate computer operations.