Question: Drive Setup allows formatting in what Apple file system?
Context: The extended file system, or ext, was implemented in April 1992 as the first file system created specifically for the Linux kernel.  It has metadata structure inspired by the traditional Unix File System (UFS) and was designed by Rémy Card to overcome certain limitations of the MINIX file system.  It was the first implementation that used the virtual file system (VFS), for which support was added in the Linux kernel in version 0.96c, and it could handle file systems up to 2 gigabytes (GB) in size. Drive Setup is the default disk formatting tool in Mac OS 7.5.2-9.2.2.  It supports such features as partitioning, and low-level formatting.  It could format hard drives in HFS, HFS Plus file systems, and supported formatting drives for use with Linux and A/UX. Disk formatting is the process of preparing a data storage device such as a hard disk drive, solid-state drive, floppy disk or USB flash drive for initial use.  In some cases, the formatting operation may also create one or more new file systems.  The first part of the formatting process that performs basic medium preparation is often referred to as "low-level formatting".  Partitioning is the common term for the second part of the process, making the data storage device visible to an operating system.  The third part of the process, usually termed "high-level formatting" most often refers to the process of generating a new file system.  In some operating systems all or parts of these three processes can be combined or repeated at different levels and the term "format" is understood to mean an operation in which a new disk medium is fully prepared to store files. Apple File System (APFS) is a proprietary file system for macOS, iOS, tvOS and watchOS, developed and deployed by Apple Inc. It aims to fix core problems of HFS+ (also called Mac OS Extended), APFS's predecessor on these operating systems.  Apple File System is optimized for flash and solid-state drive storage, with a primary focus on encryption. In a computer file system, a fork is a set of data associated with a file system object.  File systems without forks only allow a single such set of data for the contents, while file systems with forks allow multiple such contents.  Every non-empty file must have at least one fork, often of default type, and depending on the file system, a file may have one or more other associated forks, which in turn may contain primary data integral to the file, or just metadata.  Unlike "extended attributes", a similar file system feature which is typically of fixed size, forks can be of variable size, possibly even larger than the file's primary data fork.  The size of a file is the sum of the sizes of each fork.  Forks are also known as streams, since they are of variable size (unlike fixed size metadata), but this differs from . The Apple Filing Protocol (AFP), formerly AppleTalk Filing Protocol, is a proprietary network protocol, and part of the Apple File Service (AFS), that offers file services for macOS and the classic Mac OS.  In macOS, AFP is one of several file services supported, with others including Server Message Block (SMB), Network File System (NFS), File Transfer Protocol (FTP), and WebDAV.  AFP currently supports Unicode file names, POSIX and access control list permissions, resource forks, named extended attributes, and advanced file locking.  In Mac OS 9 and earlier, AFP was the primary protocol for file services. The Compact Disc File System (CDFS) is a file system for read-only and write-once CD-ROMs developed by Simson Garfinkel and J. Spencer Love at the MIT Media Lab between 1985 and 1986.  The file system provided for the creation, modification, renaming and deletion of files and directories on a write-once media.  The file system was developed with a write-once CD-ROM simulator and was used to master one of the first CD-ROMs in 1986.  CDFS was never sold, but its source code was published on the Internet and the CD-ROMs were distributed to Media Lab sponsors.  The file system is the basis of WOFS (Write-once File System), sold by N/Hance systems in 1989. The Parallel Virtual File System (PVFS) is an open source parallel file system.  A parallel file system is a type of distributed file system that distributes file data across multiple servers and provides for concurrent access by multiple tasks of a parallel application.  PVFS was designed for use in large scale cluster computing.  PVFS focuses on high performance access to large data sets.  It consists of a server process and a client library, both of which are written entirely of user-level code.  A Linux kernel module and pvfs-client process allow the file system to be mounted and used with standard utilities.  The client library provides for high performance access via the message passing interface (MPI).  PVFS is being jointly developed between The Parallel Architecture Research Laboratory at Clemson University and the Mathematics and Computer Science Division at Argonne National Laboratory, and the Ohio Supercomputer Center.  PVFS development has been funded by NASA Goddard Space Flight Center, Argonne, NSF PACI and HECURA programs, and other government and private agencies.  PVFS is now known as OrangeFS in its newest development branch. HFS Plus or HFS+ is a file system developed by Apple Inc. It served as the primary file system of macOS.  HFS+ was developed to replace the Hierarchical File System (HFS) as the primary file system used in Macintosh computers (or other systems running the classic Mac OS).  It is also one of the formats used by the iPod digital music player.  HFS Plus is also referred to as Mac OS Extended or HFS Extended, where its predecessor, HFS, is also referred to as "Mac OS Standard" or "HFS Standard".  During development, Apple referred to this file system with the codename "Sequoia".  At WWDC 2017, Apple announced macOS High Sierra, in which the default file system of Mac is changed to APFS. Apple HD SC Setup was a small software utility that was bundled with various versions of the classic Mac OS and A/UX operating systems made by Apple Computer.  Introduced with Apple's first SCSI hard drive, the Hard Disk 20SC in September 1986, Apple HD SC Setup can update drivers and partition and initialize hard disks.  It was often used when reinstalling the operating system of an Apple Macintosh computer, or to repair corrupt partition information on a SCSI hard disk.  Prior to its introduction, formatting of disks was handled exclusively by the Mac's Finder application, or third party formatting utility software customized for a specific disk drive.
Answer: HFS+