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 whilst ensuring your solution meets business and security requirements.
What should you do?

A.
You should consider creating a new forest and domain named extranet.gnb.com You should then create user accounts for Stanford Ltd users in this domain You should finally create an external trust relationship in which the extranet domain trusts the ch.gnbank.com domain

B.
You should consider creating a child domain of the ch.gnb.com domain for the extranet You should then create user accounts for Stanford Ltd users in this domain

C.
You should consider creating a new child domain named extranet.gnb.com in the existing forest.
You should then create user accounts for Stanford Ltd users in this domain You should finally create shortcut trusts in which the child domain trusts every domain in the forest

D.
You should consider creating a new forest and domain named extranet.gnb.com.
You should then create all user accounts for Stanford Ltd users in this domain You should finally create a one-way forest trust relationship in which the extranet forest trusts Stanford Ltd forest