Which one of the following isnotan example of private law?

a.MegaCorp is suing MiniCorp for unpaid invoices.

b.Mervin has not paid the paperboy for three months.

c.Fred and Ethel are two neighbours who are fighting about loud parties in Fred's backyard.

d.A lawsuit is ongoing between Joe the plumber and the government agency that hired Joe to fix the leaking sink in the lunchroome.Mary complains that a government letter about her private income taxes was not in one of the official languages.