Which of the following security issues does the Bell-La Padula model focus on?

Authorization is a general concept of defining access rights; while Bell-LaPadula implements a form of authorization for confidentiality, it is not the primary focus of the model.

The Bell-LaPadula model is explicitly designed to enforce confidentiality, using rules like 'no read down' (Simple Security Property) and 'no write up' (*-Property) to prevent subjects from accessing information at a higher security level or writing information to a lower security level. This ensures that sensitive information remains protected from unauthorized disclosure within multi-level security systems.

The Bell-LaPadula model does not directly address integrity; the Biba model is designed to maintain integrity by preventing unauthorized modification of information.

Authentication is the process of verifying a user's identity, which is a prerequisite for access control but separate from how information access is controlled based on security levels in Bell-LaPadula.