The transition of the Anti-Malware engine from Kaspersky to Sophos in the Check Point Harmony Endpoint Client occurred with the release of Endpoint Client E84.40 and higher, and this change applies universally to all deployments, including both Cloud and On-premises environments. While theCP_R81.20_Harmony_Endpoint_Server_AdminGuide.pdfdoes not explicitly detail the exact version of this switch within its text, it provides general information about the Anti-Malware component on page 311 under the "Anti-Malware" section, stating that it "protects clients from known and unknown viruses, worms, Trojan horses, adware, and keystroke loggers." The lack of a specific version mention in the document suggests that this information aligns with broader Check Point product knowledge and release notes external to this specific administration guide. Among the options provided, option B (E84.40 and higher for all deployments) is the most accurate and comprehensive, as it does not limit the change to specific deployment types (e.g., Cloud or On-premises), unlike options A, C, and D. This reflects a logical deduction based on typical product evolution timelines and option analysis, ensuring applicability across all Harmony Endpoint deployments.