Which automated tool should Angela use to test a web browser's handling of unexpected data?

The appropriate choice for testing a web browser's handling of unexpected data is a fuzz testing tool. Fuzz testing involves providing random, invalid, or unexpected data inputs to see how a web application or service responds. This approach is valuable for identifying vulnerabilities, crashes, and security flaws that may arise when the system encounters data it does not expect.

A specific tool like zzuf is a fuzz testing tool that can manipulate data inputs strategically, making it particularly suited for this purpose. It allows testers to observe how applications behave under unusual or malformed input conditions, which can help discover potential vulnerabilities in the processing of data within the web browser.

Choosing a fuzzing tool, like zzuf, stands out in this context because it embodies the target of fuzz testing: to push the limits of the application's input handling capabilities and ensure robust error handling and security measures. Other tools listed, such as Burp Suite and OWASP ZAP, primarily focus on different aspects of security testing, like proxying traffic, vulnerability scanning, or application security assessment, but are not specifically designed for fuzz testing inputs. Thus, emphasizing the role of fuzz testing aligns perfectly with the requirement of testing a web browser's response to unexpected data formats.