Access Controls - Explain how MAC, DAC, and RBAC methods accomplish their objective

Question A

Created to enforce the rules and objectives of an established security policy, access control models dictate how subjects can access objects. There are three main models: discretionary access control (DAC), mandatory access control (MAC), and role-based access control.

Explain how MAC, DAC, and RBAC methods accomplish their objective. Include the pros/cons, comparing them against other types of access controls. Describe the type of environment where each of the controls may be used. Justify.