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Which of the following is an example of a content restriction?
a. Requiring a group of protestors to march through the downtown only on Main Street
b. Enjoining someone from posting defamatory or copyrighted material
c. Requiring a group of protestors to march through designated downtown streets only from 10:00-11:00 a.m. on a Saturday
d. Enjoining someone from continuing to disrupt a live legislative session