Question:Which of the following responsibilities belongs to the certification body?

It is the certification body’s responsibility to ensure that an audit plan is established prior to the audit.

ISO/IEC 17021-1:2015 Clause 9.2.3.1 requires certification bodies to “ensure that an audit plan is established, communicated, and agreed upon.”

Updating or communicating the plan can be tasks delegated to the audit team leader, but the accountability for establishing the audit plan remains with the certification body.