Classify the given items as belonging to the public domain or protected by copyright law.

There aren't any items to classify.

Explanation:

Public domain refers to the state of belonging or being available to the public as a whole, so there is not copyright. Some examples include classical music works, artwork such as the Mona Lisa, literature works like the ones written by Shakespeare, Poe and some others.

Copyright is a mean of protecting an author's work; this type of intellectual property provides exclusive publication, distribution and usage rights for the author. Some examples are poems, books, plays, films and artwork.

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a. symbolism

b. opinions

all of them

c. hidden messages

d. political statements