answer 1. For each of the following four situations, please answer whether a user U can have access to a document D under the Bell Lapadula policy. Briefly explain each of your answers. In all of the four questions, assume that the classification level of D is secret and D belongs to categories C and C2. 5 marks will be given for each correct (20 marks) (a) U has top secret clearance level and access to category C. (b) U has secret clearance level and access to categories C, C2, C3. (c) U has confidential clearance level and access to categories C, C. (d) U has top clearance clearance level and access to categories C1, C2