The primary benefit of a tabletop exercise for an incident response plan is to increase confidence in the team's response readiness (D). A tabletop exercise is a simulated scenario that tests the effectiveness and efficiency of the incident response plan and team. It allows the team to practice their roles and responsibilities, review their procedures and tools, and identify and resolve any gaps or issues in their response process. A tabletop exercise can help the team to improve their skills, knowledge, and communication, and to prepare for real incidents1.

This control is best implemented through system configuration because it can be enforced automatically by setting a parameter in the network operating system or directory service. This ensures that temporary workers do not have access to the network beyond their authorized period, and reduces the risk of unauthorized or malicious use of their accounts12.
References1: Configuration and Change Management - CISA2: What is IT Governance? - Definition from Techopedia

Mapping IT processes to roles is an activity that provides an IS auditor with the most insight regarding potential single person dependencies that might exist within the organization. Single person dependencies occur when only one person has the knowledge, skills, or access rights to perform a critical IT function.
Mapping IT processes to roles can help to identify such dependencies and assess their impact on the continuity and security of IT operations. The other activities do not provide as much insight into single person dependencies, as they do not show the relationship between IT processes and roles. References: CISA Review Manual, 27th Edition, page 94

DLP technologies are designed to prevent the unauthorized transmission or leakage of sensitive data, such as PII, intellectual property, or financial information, by employees or other insiders. DLP technologies can monitor, detect, and block data in motion, data at rest, and data in use across various channels, such as email, web, cloud, or removable devices. DLP technologies can also help enforce data security policies and compliance requirements.
References
ISACA CISA Review Manual, 27th Edition, page 253
The role of disclosures in risk assessment and mitigation
Mitigate Risk Strategy for Information Management