Assume a system with N job positions. For job position i, the number of individual users in that position is Ui and the number of permissions required for the job position is Pi. N, Ui, and Pi are reflected in the table below.

Position Users (Ui) Permissions required (Pi)

1 1 8

2 12 4

3 4 6

4 6 5

5 9 3

(a) For a traditional DAC scheme, how many relationships between users and permissions must be defined?

(b) Using the same situation from the previous question, how many relationships between users and permissions must be defined for an RBAC scheme?