Final answer:
According to Jeff Crume, the challenges of Insider Threats and Malware are decreasing in number.
Step-by-step explanation:
Two of the challenges that are decreasing in number, according to Jeff Crume, are a. Insider Threats and Malware. These challenges are being addressed through increased security measures such as two-factor authentication, stronger passwords, and education to avoid getting scammed. By implementing these measures, the number of insider threats and malware incidents can be reduced.