Which of these are partitions of the set of real numbers?
a. the negative real numbers, {0}, the positive real numbers
b. the set of irrational numbers, the set of rational numbers
c. the set of intervals [k, k + 1], k = ...,-2,-1,0, 1,2, ...
d. the set of intervals (k, k + 1), k = ...,-2,-1,0, 1,2, ... ?
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