Property list (Plist) files are used by iOS devices to store data. Which of the file formats below is common to plist files?

Property List (Plist) files are a fundamental data storage mechanism in iOS and macOS for serializing objects. They can exist in two primary formats: a human-readable XML format and a more compact, efficient binary format. On iOS devices, the binary format is very common, and often the default, because it requires less storage space and can be parsed more quickly by the system. This performance advantage is critical for resource-constrained mobile environments.

A. HTML is a markup language used for creating and structuring web pages, not for storing serialized application data or settings.
B. SQL is a query language for managing data in relational databases like SQLite, which is also used on iOS, but it is not a Plist file format.
C. DMG (Apple Disk Image) is a container format used primarily on macOS for software distribution and is not used for Plist files on iOS.

1. Apple Developer Documentation, About Property Lists: "A property list is an object graph of common data types, serialized to an XML or binary format... The binary format is not human-readable, but is more compact and can be parsed more efficiently." This document is the official vendor source defining the nature and formats of Plist files.

2. Zdziarski, J. (2012). Hacking and Securing iOS Applications. O'Reilly Media, Inc. In Chapter 3, "Forensic Analysis of the Application Sandbox," the author discusses application data storage, stating, "Property list files (plists) are used heavily throughout iOS... These files can be stored as either XML or in a binary format." This peer-reviewed publication confirms the use of both formats in the context of iOS security and forensics.

3. Casey, E., & Al-Zain, M. A. (2020). Practical Mobile Forensics (4th ed.). Packt Publishing. Chapter 5, "iOS Forensics," details the file systems and data types found on iOS devices. It explicitly mentions that Property Lists (.plist files) are found in both XML and binary formats and are a primary source for user and application data.