The correct answer is File system

• File system
  • A file system is a process that manages how and where data on a storage disk, typically a hard disk drive (HDD), is stored, accessed and managed.
  • It is a logical disk component that manages a disk's internal operations as it relates to a computer and is abstract to a human user.
  • Commonly used file systems include File Allocation Table 32 (FAT 32), New Technology File System (NTFS) and Hierarchical File System (HFS).
• Database 
  • A database is a systematic collection of data.
  • They support electronic storage and manipulation of data. Databases make data management easy.
  • Example of Database-
    • An online telephone directory uses a database to store data of people, phone numbers, and other contact details.
    • The electricity service provider uses a database to manage billing, client-related issues, handle fault data, etc.
• Operating system
  • An Operating System (OS) is an interface between a computer user and computer hardware.
  • An operating system is a software that performs all the basic tasks like file management, memory management, process management, handling input and output, and controlling peripheral devices such as disk drives and printers. 
  • Operating System (OS) is a type of system software kernel that sits between computer hardware and end-user.
  • It is installed first on a computer to allow devices and applications to be identified and therefore functional.