@Kayode Alabi Correct Answer: C. Preserve the device and logs under chain of custody with legal Explanation (CISSP logic): The clues are "HR suspects", "source code", "leaves Friday" and "search the laptop today". Suspected theft of intellectual property by an employee is a legal matter before it is a technical one, and anything the organization might later put in front of a court, a regulator or an arbitrator has to be collected in a way that survives challenge. Security Operations owns evidence handling: preserve first, under chain of custody, with legal and HR setting the boundaries of the investigation. Assess before you act: a search that starts before preservation can destroy the very proof it is looking for. Breakdown: A. Reviewing the file history sounds like the fastest way to confirm or clear the suspicion, and the CTO will get an answer today. But every file opened, every timestamp touched and every login by IT changes the evidence, and a finding produced without chain of custody is a story, not proof, that the engineer's lawyer will take apart. B. The strong distractor. Disabling accounts and taking the laptop feels like decisive containment and it does stop further copying. But the engineer is still employed, and revoking access and seizing property without HR and legal sign-off invites a wrongful treatment claim, tips off the suspect before evidence is secured and still leaves the device unpreserved in the hands of whoever grabbed it. C. ✅ Correct. Preserving the laptop, its image and the relevant logs under documented chain of custody keeps every option open: an internal HR outcome, a civil claim or a criminal referral. Legal decides what may be examined and by whom, HR handles the employee, and the forensic review that follows is admissible because it started right. D. Law enforcement may well be involved before this is over, and for some jurisdictions and contracts that referral is required. It is a decision for legal counsel with preserved evidence in hand, not the first move on a suspicion, and reporting before preservation hands investigators a case with no exhibits.