A change management process is a set of procedures and activities that ensure that any changes to the IT systems or applications are planned, approved, tested, implemented, and documented in a consistent and controlled manner.
A change management process has recently been updated with new testing procedures. This means that the process has been improved or modified to include new or additional steps or methods for verifying and validating the changes before they are deployed to the production environment.
The next course of action after updating the change management process with new testing procedures is to communicate to those who test and promote changes. This means that the change management team or function should inform and educate the people who are involved or affected by the changes, such as the developers, testers, users, customers, etc., about the new testing procedures, their purpose, benefits, requirements, and expectations.
Communicating to those who test and promote changes helps to ensure that the new testing procedures are understood and followed by all the parties, that the changes are tested and promoted in accordance with the process standards and criteria, and that the changes are delivered with the expected quality and performance.
The other options are not the next courses of action after updating the change management process with new testing procedures. They are either secondary or not essential for change management.
The references for this answer are:
Risk IT Framework, page 27
Information Technology & Security, page 21
Risk Scenarios Starter Pack, page 19