When is it necessary to select authorize a dhcp server in active directory?

DHCP server is used to allocate IP addresses. 
When you install the DHCP Server role on a computer that is not a member of an Active Directory Domain Services (AD DS) domain, the DHCP Server must be manually authorized in the domain. 
When the computer is a member of the AD DS then the authorization is made automatically. 

Good job, jason. he's more successful than i'll ever be loolll

Idon't see any answer choices for your question, but the answer would to highlight the box, and drag the box to the box of choice (or do a simple copy and paste, and delete the old data).