Match the treatment of unrealized gains and losses on debt investments existing at the time of transfer between investment categories with the correct transfer scenario.

a. AFS or HTM to Trading AFS or HTM to Trading drop zone empty.
b. Trading to AFS or HTM Trading to AFS or HTM drop zone empty.
c. HTM to AFS HTM to AFS drop zone empty.
d. AFS to HTM AFS to HTM drop zone empty.
d. None are recognized because they already have been recognized in income.