The correct answer is B - Access logs.
As outlined in the WGU Cybersecurity Architecture and Engineering (KFO1 / D488) materials, access logs record who accessed which system components, when they did so, and what changes they made. These logs are vital for creating an audit trail that can be reviewed to detect unauthorized changes to applications or systems.
NetFlow logs (A) track network traffic flows but not system or application changes. Packet capture logs (C) deal with network data but are not specialized for auditing application-level events. Router logs (D) capture network device activity, not application access information.
Reference Extract from Study Guide:
"Access logs maintain detailed records of user actions within systems and applications, providing the necessary audit trail for tracking authorized and unauthorized activities."
- WGU Cybersecurity Architecture and Engineering (KFO1 / D488), Log Management Concepts

* The feature in collaboration software that allows only one user to modify a document at a time ensures data integrity.
* Data integrity refers to the accuracy and consistency of data over its lifecycle.
* By restricting modification access to one user at a time, the system prevents concurrent changes that could lead to data conflicts or corruption.
* The other options:
* Data availability ensures data is accessible when needed.
* Data confidentiality ensures data is protected from unauthorized access.
* Data accessibility refers to the ease of accessing data.
* Therefore, ensuring data integrity is the purpose of this feature.
References:
* "Database Systems: The Complete Book" by Hector Garcia-Molina, Jeffrey D. Ullman, and Jennifer Widom, which discusses data integrity.
* "Collaborative Computing: Theory, Practice, and Tools" by Vladimir Dimitrov, which covers features in collaboration software.

Identity federationallows authentication credentials to be used across multiple systems or domains- includingon-premises and cloud platforms-without duplicating user databases.
NIST SP 800-63C (Federated Identity Guidelines):
"Federation enables users to access multiple, disparate services using a single digital identity that can be shared securely across organizational boundaries." This approach is essential in hybrid architectures where cloud VMs and on-prem servers must recognize acentralized identity providerlike Active Directory.
#WGU Course Alignment:
Domain:Access Control and Identity Management
Topic:Implement federated identity in hybrid and multi-cloud environments

The correct answer is B - Tabletop exercises.
WGU Cybersecurity Architecture and Engineering (KFO1 / D488) defines a tabletop exercise as a controlled simulation where participants discuss their roles during a simulated disaster scenario. It allows the evaluation of the plan without causing real disruption to operations.
Walk-throughs (A) review plans but are less interactive. Checklists (C) are passive validation. Full interruption tests (D) would disrupt operations, which the company wants to avoid.
Reference Extract from Study Guide:
"Tabletop exercises allow teams to simulate disaster scenarios in a controlled, discussion-based format, helping validate plans without impacting real-world operations."
- WGU Cybersecurity Architecture and Engineering (KFO1 / D488), Disaster Recovery Testing Methods

The correct answer is D - Block ciphers.
Per the WGU Cybersecurity Architecture and Engineering (KFO1 / D488) materials, block ciphers encrypt fixed-size blocks of data at a time, providing strong security suitable for data at rest, such as databases.
Though they may be less performance-efficient compared to stream ciphers, their strength makes them ideal for securing stored sensitive information.
Stream ciphers (A) are optimized for real-time encryption, not stored data. Asymmetric encryption (B) is slower and more suited for key exchange rather than large data encryption. Hash functions (C) provide integrity verification, not encryption.
Reference Extract from Study Guide:
"Block ciphers encrypt fixed-length blocks of data, providing robust security ideal for protecting data at rest, such as sensitive database information."
- WGU Cybersecurity Architecture and Engineering (KFO1 / D488), Encryption Technologies