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A partially ordered set is said to be a lattice if every two elements in the set have 

  1. A unique least upper bound
  2. A unique greatest lower bound

C is answer .

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A lattice is an abstract structure studied in the mathematical subdisciplines of order theory and abstract algebra. It consists of a partially ordered set in which every two elements have a unique supremum (also called a least upper bound or join) and a unique infimum (also called a greatest lower bound or meet) 

https://en.wikipedia.org/wiki/Lattice_(order)

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