Peter goes to a university with a large number of courses. However, some of the courses are advanced and he can take them only after having the right prerequisites.

The following chart represents the order in which he can take the courses.

Peter is a very curious person and he wants to make sure that he always has the opportunity to learn as many new things as possible.

Obviously Peter has to start first taking 16A and then 16B, both of which are mathematics courses. What sort of a course should Peter take for his third course so that he has the maximum number of open options for his fourth course?

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