Which term refers to the branch associated with National Security in the FDNS acronym?

The term that refers specifically to the branch associated with National Security within the FDNS acronym is FDNS-NSB. FDNS stands for Fraud Detection and National Security, and the NSB component specifically highlights its focus on national security. This branch plays a crucial role in identifying and mitigating risks related to national security, including reviewing immigration applications for any potential security threats. The other terms provided—FDO, FDU, and FEB—do not directly denote a subdivision explicitly related to national security within the FDNS framework. Therefore, FDNS-NSB is the accurate and appropriate term to identify this aspect of the organization.