Which of the following would be a potential match for the Perl-based regular expression /fo{2,4}/?
i) fol
ii) fool
iii) fooool
iv) fooooool
a) Only i)
b) ii) and iii)
c) i), iii) and iv)
d) i) and iv)

Answer: b
Explanation: This matches f followed by two to four occurrences of o.