You have a domain that was created and configured with WebLogic 10.3.5. You want to upgrade the domain to use WebLogic 12c. Which Oracle tool must you use to upgrade your domain?（）
- AOracle WebLogic Domain Upgrade tool
- BSmart Update
- CSmart Upgrade
- DNo tool required, just install WebLogic 12c, update the domain to point to the new WebLogic installation and start your domain.
- EJDeveloper