What is the Bank for International Settlements (BIS)? What three categories does the BIS designate in the foreign-exchange market? Briefly describe each category

What is the Bank for International Settlements (BIS)? What three categories does the BIS designate in the foreign-exchange market? Briefly describe each category.

Only resource:

International Business- Environments & Operations
John D. Daniels, Lee H. Radebaugh, & Daniel P. Sullivan, 2018
Pearson

Essay must be sourced from referenced book. Thanks!