Please answer the following questions. Please leave a brief explantaion of the answer: Please answer within the next 6 hours.

Question 4 The Bell-LaPadula Model is associated with Question options, only one answer can be selected: 1) mandatory access control 2) discretionary access control 3) role-based access control Question 9 An important principle of mandatory access control is Question options: 1) access control is mandatory at all times. 2) information flows up, not down. C 3) all information must be kept secure