The correct answer is C. The Change Log in SmartConsole is used to keep a record of changes made to objects and configuration during administrative work. This supports accountability, troubleshooting, and review of what changed before or after publishing. Option A is wrong because policy installation is performed through the Install Policy workflow after changes are published. Option B is wrong because user sessions are handled through session management controls and administrator-session views, not the object Change Log itself. Option D is wrong because network traffic monitoring is performed using logs, SmartView Monitor, SmartEvent, and related monitoring views. The purpose of the Change Log is administrative traceability: when an object is modified, the administrator can review what was changed and understand object-history context. This is especially important in multi-administrator environments where several sessions may modify policies and objects before publication. Reference topics: SmartConsole object management, Change Log, administrative changes, sessions and revisions.