Final answer:
The Commissioner will refund part of the professional bondsman's security deposit when the debt is paid off.
Step-by-step explanation:
According to the information provided, the Commissioner will refund part of the professional bondsman's security deposit when the debt is paid off. This implies that the security deposit serves as a guarantee for the debt, and once the debt is settled, the bond is returned. It is a common practice when it comes to security deposits for debts, ensuring the creditor's protection.