When creating association rules, why is it common to only consider rules with a support measure above a minimum threshold?

a. Rules with too low of a support are unlikely to be true.

b. Rules with too low of a support measure may not occur frequently enough to represent true correlated itemsets or to be useful for business decision making.

c. Rules with too low of a support are unsurprising.

d. A minimum support threshold is unnecessary if item granularity is defined appropriately.