When debentures are issued with a specified rate of interest, then these types of debentures are called:

Specific Coupon Rate Debentures

The correct answer is option 4- Specific Coupon Rate Debentures.

Specific Coupon Rate Debentures: These debentures are issued with a specified rate of interest, which is called the coupon rate. The specified rate may either be fixed or floating. The floating interest rate is usually tagged with the bank rate.

OTHER OPTIONS

• Bearer Debentures: Bearer debentures can be transferred simply by delivery, and the company does not maintain any records of the debenture holders. Interest payments on bearer debentures are made to whoever presents the attached interest coupon.
• Zero Coupon Rate Debentures: Zero coupon rate debentures do not carry a specific interest rate. To compensate investors, these debentures are issued at a substantial discount, with the difference between the nominal value and the issue price representing the interest for the debenture's duration.
• Unsecured Debentures: Unsecured debentures do not have a specific claim on the company's assets. However, in the event of default, a floating charge may be created on these debentures. Generally, companies do not issue these types of debentures.