Which one of the following statements about access control matrices is true? A) In an installation with a large number of users and number of files, the matrix would be quite small. B) Because allowing access to a file is the exception rather than the rule, the matrix will be rather dense. C) The entry a_ij is 1 if user i is allowed access to file j. D) The entry a_ij is 1 if user i may not be access file j.

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The access control matrix is a model used to define the rights of each user to each file, where the entry a_ij is 1 if user i is allowed access to file j.

Which One of the Following Statements About Access Control Matrices