Which is true about stateless and statefull firewalls?
1.Stateless only operates at Layer 3. Statefull operates at Layer 3 and 4.
2.Stateless operates at Layer 3 and 4. Statefull operates only at Layer 3.
3.Stateless only operates at Layer 4. Statefull operates at Layer 3 and 4.
4.Stateless operates at Layer 3 and 4. Statefull only operates at Layer 4.