Final answer:
The invalid approach for a Scrum Master to facilitate communication is filtering information; the Scrum Master should promote transparency and direct interactions.
Step-by-step explanation:
The approach that is NOT considered a valid way for the Scrum Master to help facilitate effective communications between the Developers and the Product Owner is c) Filtering information. As a Scrum Master, one should encourage open and transparent communication. Organizing regular meetings, acting as a mediator, and fostering collaboration are considered valid methods to improve communication. The Scrum Master should enable direct interaction and the exchange of unfiltered information to ensure a clear understanding and avoid misinterpretations or a loss of critical details.