The answer for which item is included in the nims management characteristic of accountability? Is Check-In/Check-Out of incident personnel. This question comes with multiple choice answers. Establish specific, measurable objectives, Check-In/Check-Out of incident personnel, Maintain an accurate inventory of resources & Conduct briefings as part of transfer of command.

What are the NIMS Management Characteristics?
The Incident Command System (ICS) is built on the 14 proven NIMS management qualities listed below, each of which contributes to the overall system’s strength and efficiency:
Common Terminology
Modular Organization
Management Based on Objectives
Planned Incident Response
Controllable Span of Control
Incident Facilities and Locations
Integrated Resource Management
Integrated communications
Command Establishment and Transfer
The Unified Command
Chain of Command and Command Unity
Accountability
Dispatch/Deployment
Management of Information and Intelligence

What are the Main Principles of Accountability?
Effective accountability is critical during incident operations. You must follow agency policies and standards and any applicable rules and regulations as part of the Incident Command System (ICS) structure.
Check-In/Check-Out. To obtain an assignment, all respondents must report in. Checking out is just as important as checking in.
Incident Action. Response operations must be organized in accordance with the Incident Action Plan.
Each individual will be allocated to a single supervisor.
Supervisory span requires supervisors to be able to monitor and control their subordinates appropriately and communicate with and manage all available resources under their supervision.
Personal ICS is based on everyone accepting personal accountability for their own acts.
Resource Supervisors must document and report changes in resource status as they occur. Accountability begins when a resource is requested and ends when it safely returns to its home base.
Personal accountability is crucial to the efficacy of the reaction. Each member is accountable for staying aware of their surroundings and reporting any safety issues to the chain of command.

Conclusion
Accountability is one of the 14 fundamental principles linked with the NIMS management system. It also has its own set of principles. Check-In/Check-Out of incident personnel is the most important point in those principles. We hope now that you have a clear idea about why Check-In/Check-Out of incident personnel is the answer to which item is included in the nims management characteristic of accountability?
References
https://emilms.fema.gov/is_0200c/groups/15.html
https://www.fhwa.dot.gov/security/emergencymgmt/profcapacitybldg/docs/nims/nims_wkbk.htm