You work as an administrator at ABC.com. The ABC.com network consists of a single domain named ABC.com. All servers in the ABC.com domain， including domain controllers， have Windows Server 2012 R2 installed.ABC.com has a domain controller， named ABC-DC01， which contains the ABC.com domain’s primary DNS zone. ABC.com’s workstations refer to ABC-DC01 as their primary DNS server. You have been instructed to make sure that any DNS requests that are not for the ABC.com domain， is resolved by ABC-DC01 querying the DNS server of ABC.com’s Internet Service Provider （ISP）.  
Which of the following actions should you take？（）