Final answer:
The Commissioner will refund all of the professional bondsman's security deposit when the debt is paid off.
Step-by-step explanation:
According to the information provided, when a debt is paid off, the bond is typically returned. Therefore, in the context of the question, it can be inferred that the Commissioner will refund all of the professional bondsman's security deposit when the debt is paid off. This implies that the security deposit serves as collateral for the debt, and once the debt is settled, the Commissioner will no longer require the security deposit.