Which of the following enhances the security of a firm's database management system by specifying the type of information that a user can obtain?

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Access matrix is a security model that specifies the type of information a user can obtain by defining the access rights of each user to every object in the system. It enhances the security of a firm's database management system by controlling and limiting unauthorized access to certain information. The other options, such as file-sharing, search engines, main servers, and intranets, are not directly related to specifying the type of information that a user can obtain and do not enhance the security of a firm's database management system.

Which of the Following Enhances the Security of a Firm's