Refer to the exhibit.

Comprehensive and Detailed Explanation:

The exhibit contains STIX (Structured Threat Information Expression) formatted threat intelligence indicating:

A phishing indicator related to the domain:apponline-8473.xyz

Associated malicious IP addresses:164.90.168.78and199.19.224.83

Labelled as "malicious-activity" with "xfe-threat-score-10"

Based on this:

Option B is correct: The IP addresses explicitly listed in the pattern field should be blacklisted to prevent command-and-control or malicious connections.

Option C is correct: The domainapponline-8473.xyzis also listed and flagged as involved in phishing, so DNS and firewall rules should block access to and from this domain.

Options A and E are too broad or speculative; the data specifies a specific domain, not a generic block on all emails or URLs. Option D refers to a label used for classification and not a directly actionable item.

Therefore, the correct answers are: B and C.