You work as an Exchange Administrator for UniCom Inc.The company has a Windows 2008 Active Directory-based contains an Exchange Server 2010 organization.The name of your company is recently changed to TechWorld Inc that whenever they send e-mails to uc.com， they are bounced back.However， when they send an e-mail to TechWorld.Which of the following actions will you perform to resolve the issue？（）
- AAdd techworld.com as an authoritative domain in accepted domain.
- BAdd uc.com as an internal relay domain in accepted domain.
- CAdd uc.com as an authoritative domain in accepted domain.
- DAdd techworld.com as an internal relay domain in accepted domain.