Explanation/Reference:
Explanation:
'Content-dependent' access control is a form of access control required by many applications. It is defined as access control where the decision to allow access to an object depends upon the value of attributes of the user and target objects themselves. One drawback with Content-dependent access control is that extra processing is required.
Incorrect Answers:
B: Content-dependent protection does not require an additional password entry.
C: Content-dependent protection does not lock data.
D: Content-dependent protection does not limit any address space.
References:
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.41.5365

Details:
The Answer: Bell-LaPadula model
The Bell-LAPadula model is also called a multilevel security system because users with different clearances use the system and the system processes data with different classifications. Developed by the US Military in the 1970s.
A security model maps the abstract goals of the policy to information system terms by specifying explicit data structures and techniques necessary to enforce the security policy.
A security model is usually represented in mathematics and analytical ideas, which are mapped to system specifications and then developed by programmers through programming code. So we have a policy that encompasses security goals, such as "each subject must be authenticated and authorized before accessing an object." The security model takes this requirement and provides the necessary mathematical formulas, relationships, and logic structure to be followed to accomplish this goal.
A system that employs the Bell-LaPadula model is called a multilevel security system because users with different clearances use the system, and the system processes data at different classification levels. The level at which information is classified determines the handling procedures that should be used. The Bell-LaPadula model is a state machine model that enforces the confidentiality aspects of access control. A matrix and security levels are used to determine if subjects can access different objects. The subject's clearance is compared to the object's classification and then specific rules are applied to control how subject-to-object subject-to-object interactions can take place.
Reference(s) used for this question:
Harris, Shon (2012-10-25). CISSP All-in-One Exam Guide, 6th Edition (p. 369). McGraw-
Hill. Kindle Edition.

A new data repository is added, means a new a attack surface.
Threat Model should be reviewed and revised if needed.