What is the name given to all the programs inside the computer with makes it usable?

Answer: Option B

System software is software that provides a platform for other software. Some examples can be operating systems, antivirus software, disc formatting software, computer language translators etc. These are commonly prepared by computer manufacturers. This software consists of programmes written in low-level languages that are used to interact with the hardware at a very basic level. System software serves as the interface between the hardware and the end users.