Which of the following works did Cicero write when he was nineteen, was a collection of notes and musings on the art of oratory, and outlines his five canons of rhetoric?

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De Inventione is the work that Cicero wrote when he was nineteen, which is a collection of notes and musings on the art of oratory, and outlines his five canons of rhetoric. On the Sublime, De Oratore, and Institutes of Oratory were written by Cicero later in his career.

Which of the Following Works Did Cicero Write When He