Which type of debentures can be transferred only by executing a regular transfer deed?

Convertible Debentures Zero Coupon Rate Debentures Bearer Debentures Registered Debentures

Registered Debentures

Registered debentures are those debentures in respect of which all details including names, addresses and particulars of holding of the debentureholders are entered in a register kept by the company. Such debentures can be transferred only by executing a regular transfer deed.