Which of the following is not appropriate in addressing object reuse? 

Answer options:

A. Degaussing magnetic tapes when they`re no longer needed.
B. Deleting files on disk before reusing the space.
C. Clearing memory blocks before they are allocated to a program or data.
D. Clearing buffered pages, documents, or screens from the local memory of a terminal or printer.

B

Object reuse requirements, applying to systems rated TCSEC C2 and above, are used to protect files, memory, and other objects in a trusted system from being accidentally accessed by users who are not authorized to access them. Deleting files on disk merely erases file headers in a directory structure. It does not clear data from the disk surface, thus making files still recoverable. All other options involve clearing used space, preventing any unauthorized access. Source: RUSSEL, Deborah & GANGEMI, G.T. Sr., Computer Security Basics, O`Reilly, July 1992 (page 119).