Que: Consider the set N* of finite sequences of natural numbers with a denoting that sequence a is a prefix of sequence b. Then, which of the following is true?

a. Every non-empty subset of has a greatest lower bound
b. It is uncountable
c. Every non-empty finite subset of has a least upper bound
d. Every non-empty subset of has a least upper bound
Answer: Every non-empty subset of has a greatest lower bound

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