Which aspect of Information Operations focuses on degradation or destruction of information?

The focus of Information Operations on degradation or destruction of information is encapsulated by Computer Network Attack. This aspect specifically involves offensive operations aimed at compromising or disrupting the information systems of an adversary. Through various means, such as malware, denial of service attacks, or other cyber offensive tactics, Computer Network Attack seeks to impair the integrity and availability of information, thereby achieving military objectives.

In contrast, other choices do not directly center on destruction or degradation. Computer Network Exploitation deals with gathering intelligence from adversary networks without necessarily damaging them. Information Assurance focuses on protecting and ensuring the integrity, confidentiality, and availability of information systems rather than attacking or degrading them. Finally, Cyber Defense Strategies prioritize the safeguarding of systems against attacks rather than conducting attacks themselves. Thus, Computer Network Attack is the clear choice for the aspect of Information Operations that emphasizes degradation or destruction of information.