Which spanning tree implementation meets this goal?

Refer to the exhibits.

Exhibit 1.

Exhibit 2.

The company wants to minimize congestion on Link 1.

Which spanning tree implementation meets this goal?
A . Instance 1 = VLANs 4-5 Instance 2 = VLANs 6-7Switch 2 instance 1 priority = 0 Switch 2 instance 2 priority = 1Switch 3 instance 1 priority = 1 Switch 3 instance 2 priority = 0
B . Instance 1 = VLANs 4,6 Instance 2 = VLANs 5,7Switch 2 instance 1 priority = 0 Switch 2 instance 2 priority = 1Switch 3 instance 1 priority = 1 Switch 3 instance 2 priority = 0
C . Instance 1 = VLANs 4,6 Instance 2 = VLANs 5,7Switch 2 instance 1 priority = 0 Switch 2 instance 2 priority = 1Switch 3 instance 1 priority = 0 Switch 3 instance 2 priority = 1
D . Instance 1 = VLANs 4-5 Instance 2 = VLANs 6-7Switch 2 instance 1 priority = 0 Switch 2 instance 2 priority = 1Switch 3 instance 1 priority = 0 Switch 3 instance 2 priority = 1

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Answer: C