Final answer:
The copyright granted in 1669 to Jean-Baptiste Lully likely included exclusive rights to his musical compositions, opera libretti, and stage performances, hence options a), b), and c) are correct.
Step-by-step explanation:
The copyright granted in 1669 to Jean-Baptiste Lully, the director of the Paris Opera, by King Louis XIV, provided him with exclusive rights that were significant for the time. This exclusive right granted to Lully could have included various aspects of his artistic output, most notably a) his musical compositions, which are works of authorship and therefore eligible for copyright protection. Given the culture of patronage and the importance of controlling the arts during this time as a way to exhibit power and prestige, it is also probable that Lully could have been given rights to b) opera libretti, which are the texts for operas and are akin to dramatic works that could similarly fall under copyright protections. Additionally, c) stage performances could have been included within his exclusive rights as well, which would encompass the right to display the work publicly whether it was a literary, musical, dramatic, or choreographic work. Therefore, the correct answers are a), b), and c).