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.

Clauses that specify the rights of the bondholders and any actions that the issuer is obligated to perform or is prohibited from performing are:
Option A:covenants.
Option B:collaterals.
Option C:credit enhancements.

Answer: A