Question: RBAC 2 adds constraints to the basic RBAC 0 model. Bishop describes the constraint needed to enforce the separation of duties by adding the meauth

RBAC 2 adds constraints to the basic RBAC 0 model. Bishop describes the constraint needed to enforce the separation of duties by adding the meauth primitive.

Give constraints to enforce the following separation of duty policies.

(a) A user can be in at most one role at a time.

(b) At most, one user is occupying (some specific) role R at any time

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