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Which sentence is not punctuated correctly?

1. The book Frankenstein was written by Mary Shelley, who wrote the novel at age 19.

2. The story is about a doctor who created a monster.

3. Frankenstein, which is often thought to be the monster's name, is actually the name of his creator.

4. Mary Shelley who was also married to a famous English poet lived in the 19th century.