Final answer:
Branch-based version control handles only parallel versions and doesn't handle updates automatically.
Step-by-step explanation:
A version-control tool that handles only parallel versions and does not handle updates is called branch-based version control.
In branch-based version control, each parallel version is represented as a separate branch, allowing users to work on different versions simultaneously. However, it does not handle updates automatically, meaning users need to manually merge changes from one branch to another.
Examples of branch-based version control tools include Git and Mercurial.