A financial institution has recently experienced a data breach that compromised sensitive customer information. The incident response team has successfully contained the breach and is now in the process of eradicating the threat from their systems. After thorough investigation, they discover that the breach was caused by a sophisticated phishing attack that exploited a vulnerability in their email system. As part of the eradication phase, the team must decide on the most effective approach to ensure that the threat is completely removed and that similar incidents do not occur in the future. Which strategy should the team prioritize to achieve both eradication and future prevention?