Object reuse mechanisms ensure system resources are allocated and
reassigned among authorized users in a way that prevents the leak of
sensitive information, and ensure that the authorized user of the system does not obtain residual information from system resources. Object reuse is defined as The reassignment to some subject of a storage medium
(e.g., page frame, disk sector, magnetic tape) that contained one or more objects. To be securely reassigned, no residual data can be available to the new subject through standard system mechanisms.7 The object reuse requirement of the TCSEC is intended to assure that system resources, in particular storage media, are allocated and reassigned among system users in a manner which prevents the disclosure of sensitive information.
Answer a is incorrect. Object reuse does not necessarily protect
against physical attacks on the storage medium. Answer c is also
incorrect, as object reuse applies to all primary and secondary storage media, such as removable media, fixed media, real and virtual main memory (including registers), and cache memory. Answer d refers to authorization, the granting of access rights to a user, program, or
process. Source: NCSC-TG-018, A Guide To Understanding Object
Reuse in Trusted Systems [Light Blue Book].