Answer:
Constituency
Explanation:
CSIRT stands for Computer Security Incident Response Team, they are a group of experts that are hired to handle all incidents that occurred within your computer system.
In CSIRT term, constituency refers to area of expertise that each members of the team possess along with division of responsibilities that they have within the team . Having wider range of constituency tend to make the team become more efficient and capable to handle different types of attacks to the system.