Your network contains an Active Directory domain named contoso.com. The domain contains a DHCP server
named Server1 that runs Windows Server 2012 R2.
You create a DHCP scope named Scope1. The scope has a start address of 192.168.1.10, an end address of
192.168.1.50, and a subnet mask of 255.255.255.192.
You need to ensure that Scope1 has a subnet mask of 255.255.255.0.
What should you do first?

A.
From the DHCP console, reconcile Scope1.

B.
From the DHCP console, delete Scope1.

C.
From the DHCP console, modify the Scope Options of Scope1.

D.
From Windows PowerShell, run the Set-DhcpServerv4Scope cmdlet.

Explanation:
You cannot change the subnet mask of a DHCP scope without deleting the scope and recreating it with the new
subnet mask.
Set-DhcpServerv4Scope does not include a parameter for the subnet mask.