Source: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide:
Mastering the Ten Domains of Computer Security, 2001, John Wiley & Sons, Page 333.

Cost is a factor when considering Biometrics but it is not a security characteristic.
All the other answers are incorrect because they are security characteristics related to
Biometrics.
Data acquisition process can cause a security concern because if the process is not fast and efficient it can discourage individuals from using the process.
Enrollment process can cause a security concern because the enrollment process has to be quick and efficient. This process captures data for authentication.
Speed and user interface can cause a security concern because this also impacts the users acceptance rate of biometrics. If they are not comfortable with the interface and speed they might sabotage the devices or otherwise attempt to circumvent them.
References:
OIG Access Control (Biometrics) (pgs 165-167)
From: TIPTON, Harold F. & KRAUSE, MICKI, Information Security Management
Handbook, 4th Edition, Volume 1, Pages 5-6
** in process of correction **

The Common Security Framework (CSF) is a set of security standards, best practices, and tools developed by the Health Information Trust Alliance (HITRUST) to help organizations manage the risks and compliance requirements associated with using cloud services, such as Software as a Service (SaaS). The CSF covers 19 domains of security controls, such as access control, audit logging, encryption, incident management, and vulnerability management. The CSF also provides a certification program and a self-assessment tool for organizations to measure and demonstrate their adherence to the CSF requirements. The CSF is designed to be flexible, scalable, and customizable to suit the needs and objectives of different types and sizes of organizations. The CSF is not specific to the healthcare industry, although it incorporates some healthcare-related regulations and standards, such as the Health Insurance Portability and Accountability Act (HIPAA) and the Payment Card Industry Data Security Standard (PCI DSS). The CSF can be used to determine the risks associated with using SaaS for collaboration and email, as well as other cloud services and applications. References: CISSP All-in-One Exam Guide, Eighth Edition, Chapter 3: Security Engineering, page 169. Official (ISC)² CISSP CBK Reference, Fifth Edition, Domain 3: Security Architecture and Engineering, page 385.

Section: Security Operations