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Hey guys, how are you doing?

I need to do a question: We have 15 questions in the final of the chapter 6. The question 4 said: 

Which key is derived from the 802.1X process or from the PSK in pre‐share networks?

a. RSK

b. PMK

c. GMK

d. PTK

I understood that the 802.1X process or PSK in pre-share generates the PMK key. Other thing: We have a good illustration in this chapter about key hierarchy that said: PMK - Highest order 802.11 key. Derived from MSK (802.1X or PSK).

I'm confused because the book said the correct answer is PTK (D). Can anyone explain this situation?

I need explanation for this question too. I think it is errata.