Final Answer:
Not a common method for achieving multilevel security. b. Application integrity
Step-by-step explanation:
Multilevel security involves implementing measures to protect information at different classification levels. Among the options provided, application integrity is not a common method for achieving multilevel security.
Access control lists (a) and role-based access control (c) are commonly used methods. Access control lists define permissions for users or system processes, while role-based access control assigns permissions based on roles or job responsibilities.
Application integrity, on the other hand, focuses on ensuring the reliability and correctness of software applications rather than specifically addressing multilevel security concerns. Multilevel security strategies typically involve access controls, encryption, and other mechanisms to manage and secure information based on its sensitivity.
In summary, option b, application integrity, is not a common method for achieving multilevel security, as it primarily pertains to the reliability and correctness of software applications rather than security classifications related to information access.