Which posets are lattices

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Homework Statement


Could someone help with this problem?

Determine which of the following posets (S, <=) are lattices.

1. A = {1, 3, 6, 9, 12} and <= is the divisibility relation.
2. B = {1, 2, 3, 4, 5} and <= is the divisibility relation.
3. C = {1, 5, 25, 100} and <= is the divisibility relation.
4. Both 1 and 3


Homework Equations





The Attempt at a Solution


My answer: 3

Is this right? I think it is but I'm not 100% sure.
 

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