Answer:
b. Operating system (OS)
Step-by-step explanation:
Operating System is a term that is mostly referred to as a computer system's component, program or software technology, that carry out various operations for the whole Computer System.
These operations include:
1. a user interface
2. memory management
3. a file system
4. multitasking
5. the interface to hardware devices.
Hence, in this case, the right answer is option B: Operating System.