On this particular network, which of the following is the number of collision domain that exist?

An office network consists of one two-port router connected to a 12-port switch. A four-port hub is also connected to the switch.

On this particular network, which of the following is the number of collision domain that exist?
A . 3
B . 12
C . 13
D . 14
E . 15

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Answer: D