Which of the following BEST identifies the appropriate use of threat intelligence as a function of detection and response?

A company's marketing emails are either being found in a spam folder or not being delivered at all. The security analyst investigates the issue and discovers the emails in question are being sent on behalf of the company by a third party in1marketingpartners.com Below is the exiting SPP word:

Which of the following updates to the SPF record will work BEST to prevent the emails from being marked as spam or blocked?
A)

B)

C)

D)

A security analyst is deploying a new application in the environment. The application needs to be integrated with several existing applications that contain SPI Pnor to the deployment, the analyst should conduct:

A newly appointed Chief Information Security Officer (CISO) has completed a risk assessment review of the organization and wants to reduce the numerous risks that were identified. Which of the following will provide a trend of risk mitigation?

A security analyst recently discovered two unauthorized hosts on the campus's wireless network segment from a man-m-the-middle attack .The security analyst also verified that privileges were not escalated, and the two devices did not gain access to other network devices Which of the following would BEST mitigate and improve the security posture of the wireless network for this type of attack?