The act described is doxing, which involves researching and publicly broadcasting an individual's private and identifiable information without their consent and with malicious intent. In this scenario, the hacker illegally obtained sensitive, private health records and published them online for revenge. This action is a direct violation of the employee's privacy, intended to cause harm, embarrassment, and public exposure, which are the defining characteristics of a doxing attack.

A. Anonymous expression refers to communicating without revealing one's identity. The core issue here is the malicious publication of private data, not the anonymity of the perpetrator.

C. Hate speech is defined as an attack on a person or group based on protected attributes like race or religion. The scenario describes personal revenge, not a group-based attack.

D. Libel involves publishing a false statement that damages a reputation. The hacker published presumably true health records, making the act a privacy violation, not defamation.

1. Douglas, M. K. (2016). Doxing: A conceptual analysis. Ethics and Information Technology, 18(3), 199–210. In Section 3, "A Conceptual Analysis of Doxing," the author defines doxing as "the practice of retrieving, compiling, and publishing other individuals’ personal identification information online without their consent" (p. 201). https://doi.org/10.1007/s10676-016-9406-0

2. Citron, D. K. (2016). Regulating Doxing. Washington University Law Review, 93(5), 1003-1052. The article distinguishes doxing from defamation by noting that doxing involves the publication of "true, private facts," whereas defamation (libel) involves "false statements of fact" (p. 1010).

3. Cornell Law School Legal Information Institute (LII). (n.d.). Doxing. In Wex Legal Dictionary/Encyclopedia. Retrieved from https://www.law.cornell.edu/wex/doxing. The LII defines doxing as "the act of publicly revealing previously private personal information about an individual or organization, usually via the internet and without the subject's permission."