Which of the following is true according to the libel-proof plaintiff doctrine?
a. Certain public officials are in such important positions that the media are forbidden from libeling them.
b. Certain public officials are in such important positions that they cannot sue the media for libel
c. People with already bad reputations have an easier time winning libel lawsuits.
d. Some people have reputations so bad that even false and defamatory claims cannot harm their reputations any further.