Answer: of commercial banks are unchanged, but their reserves increase.
Explanation:
Checkable Deposits refers to the deposits that are in banks which one can write checks against. They are the funds that are deposited that individuals have access to without any form of limitation.
When the commercial banking system borrows from the Federal Reserve Banks, it should be noted that the checkable deposits will not change but the bank reserves will increase as there'll be more money with the bank.