Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

The legal contract that describes the form of the bond, the obligations of the issuer, and the rights of the bondholders can be best described as a bond’s:
Option A:covenant.
Option B:indenture.
Option C:debenture.

Answer: B