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.You add the DHCP Server Role on a server named ABC_SR04. You configure DHCP to support two subnets named Subnet A and Subnet B. Subnet A has a network ID of 172.16.0.0/16 and Subnet B has a network ID of 172.16.1.0/24.All client computers are reconfigured to receive IP addresses from DHCP. However， clients on Subnet B cannot access clients on Subnet A. What is the most likely cause of this problem？（）

A. The Server Options are not configured correctly.
B. The IP address for the Router is not correctly specified in the Scope Options.
C. The IP address for the DNS Sever is not correctly specified in the Scope Options.
D. The IPv6 has not been disabled on ABC_SR04.