Heuristic scanning in antivirus software is designed to catch 100% of all known and unknownvirus technologies.

The statement is false because heuristic scanning, while a powerful tool for detecting new threats, relies on probabilities and observed behaviors, which means it cannot catch every single piece of malware without generating false positives or missing novel attack vectors.

Heuristic scanning analyzes code for suspicious behaviors and patterns to detect new or unknown malware, but it is not 100% effective. No antivirus technology, including heuristics, can guarantee detection of all known and unknown viruses due to constantly evolving threats and evasion techniques.