Final answer:
The optional section in an AP course refers to content that is not required for the AP exam but can provide additional, illustrative material to enhance understanding.
Step-by-step explanation:
The question you're asking refers to the structure of an Advanced Placement (AP®) course. In the context of AP courses, the optional section you're inquiring about likely refers to content that the College Board has designated as not required for the scope of the AP exam; it is material that may provide additional background or depth to the main curriculum but is not necessary for the exam itself. Therefore, you can study this information as optional or illustrative material, which means it won't be assessed in the AP test but might enhance your understanding of the subject.