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?（） A: Oracle WebLogic Domain Upgrade tool B: Smart Update  C: Smart Upgrade   D: No tool required, just install WebLogic 12c, update the domain to point to the new WebLogic installation and start your domain. E: JDeveloper