You need to redesign the Grand National Active Directory structure to support the new client/server application. This means accommodating an access control strategy for resources that are located in the extranet for partners and for internal users. In your solution take care to meet business and security requirements.
What should you do?

A.
Create a new child domain named extranet.gnbank.com in the existing forest.
Create user accounts for Stanford Auditors, Inc. users in this domain.
Create shortcut trusts in which the child domain trusts every domain in the forest.

B.
Create a new forest and domain named extranet.gnbank.com.
Create all user accounts for Stanford Auditors, Inc. users in this domain.
Create a one-way forest trust relationship in which the extranet forest trusts Stanford Auditors, Inc. forest.

C.
Create a new forest and domain named extranet.gnbank.com.
Create user accounts for Stanford Auditors, Inc. users in this domain.
Create an external trust relationship in which the extranet domain trusts the ch.gnbank.com domain.

D.
Create a child domain of the ch.gnbank.com domain for the extranet.
Create user accounts for Stanford Auditors, Inc. users in this domain.