Including information about the mean time to remediate (MTTR) of vulnerabilities directly addresses the CISO's need to understand the effectiveness and timeliness of the organization's response to security weaknesses. MTTR is a standard metric used to assess how quickly an organization can resolve vulnerabilities after they're identified.

While details on first detection of vulnerabilities may provide some insight into the initial security response, it does not directly speak to the effectiveness of the remediation efforts over time and is therefore not the best answer.

A forecast on future vulnerabilities might be speculative and isn't directly relevant to evaluating past remediation efforts.

A comparison with industry benchmarks for vulnerability occurrences could help in understanding the organization's relative security posture but again, does not directly indicate how effectively vulnerabilities are being remediated once identified.