问题：

[单选]

Following ticket consists of a problem description and existing configuration on the device.

Figure 1
Cisco 642-832： Practice Exam

Figure 2
Trouble Ticket Statement
HSRP has been configurationured between DSW1 and DSW2. DSW1 is configurationured to be activerouter but it never becomes active even though the HSRP communication between DSW1 and DSW2 isworking.
Configuration on DSW1
CertKiller.com
track 1 ip route 10.1.21.128 255.255.0.0 metric threshold threshold metric up 1 down 2!
track 10 ip route 10.2.21.128 255.255.255.0 metric threshold threshold metric up 63 down 64!
interface Vlan10
ip address 10.2.1.1 255.255.255.0
standby 10 ip 10.2.1.254
standby 10 priority 200
standby 10 preempt
standby 10 track 1 decrement 60
Configuration on R4
Cisco 642-832： Practice Exam
interface loopback0
ip address 10.2.21.128 255.255.255.0
Fault Condition is related to which technology？（）

A . GLBP
B . HSRP
C . OSPF
D . Switch to Switch Connectivity