Given that ISP 1 and ISP 2 are Tier 2 providers, and that ISP 3 and ISP 4 are Tier 1 providers, what is the most likely relationship between ISP 1 and the other ISPs?

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Given that ISP 1 and ISP 2 are Tier 2 providers, and that ISP 3 and ISP 4 are Tier 1 providers, what is the most likely relationship between ISP 1 and the other ISPs?
A . ISP 1 has a peering relationship with ISP 2 and ISP 4.
B . ISP 1 has a peering relationship with ISP 2 and a transit relationship with ISP 3.
C . ISP 1 has a peering relationship with ISP 2 and ISP 3.
D . ISP 1 has a transit relationship with ISP 2 and ISP 4.
E . ISP 1 has a transit relationship with ISP 2 and a peering relationship with ISP 3.

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Answer: B