Static routing involves manually configuring routes in a router's routing table. These routes do not change unless manually updated, which distinguishes static routing from dynamic routing where routes are learned and adjusted automatically by protocols. Answer 'Routes are manually configured and do not change unless manually updated' is correct because it highlights the manual aspect of static routing, a key characteristic. Other provided answers relate more to characteristics of dynamic routing, which includes automatic updating based on network traffic changes, and are therefore incorrect in this context.