letter of credit

Hi,
i am planning to give my F4(glo) version next week. I have gone through the OT notes and did all the practice questions and Mock exams several times. I have also completed both Kaplan and BPP revision kit many times. Do you think it’s sufficient for me to pass F4 on the first try?
Coming to the main reason for posting on this forum… Kaplan and bpp have a different answer to the below question:

Letters of credit are ways of transferring payment internationally through the banking system.
In this context of international payments, which of the following statements is correct?
? The issuing bank represents the seller
? The advising bank represents the buyer
? The issuing bank represents the buyer

According to Kaplan, The answer is (A)
According to BPP, The answer is (C)

Please guide me on this and the above question as well,
Thank you.