The difference between {n} and {n,} is:
a) {n} matches at least n occurrences, whereas {n,} matches exactly n occurrences
b) {n} matches exactly n occurrences, whereas {n,} matches at least n occurrences
c) {n} and {n,} match exactly n occurrences
d) {n,} generates a syntax error
b) {n} matches exactly n occurrences, whereas {n,} matches at least n occurrences
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