You have a single Active Directory directory service forest with two domains named contoso.com and corp.contoso.com. The domain functional level of each domain is set to Windows 2000 mixed. You need to enable users from both domains to access resources in both domains. What should you do?

A.
Create universal distribution groups in corp.contoso.com and add users from both domains.

B.
Create a universal distribution group in contoso.com and add users from both domains.

C.
Create global security groups in both domains and add users to the newly created security groups in their respective domain.

D.
Create a domain local security group in contoso.com and add users from both domains.