"which technique is the best way the scrum master can ensure that the development team communicates effectively with the product owner? "

I believe the answer is: Monitor communications between them and facilitate direct collaboration

In this case, Facilitating direct collaboration is usually being done by providing a clear and direct method of communication between product owner and the development team, so the development team could directly ask for opinion for every differentiation that they made in the product.

answer; false pretense;

administrative jobs normally have someone answering phone calls and scheduling appointments, filing patient or customer information, making sure the front of the office looks nice to those who enter the building. administrative jobs can also include making sure the manager has everything they need for meetings, making delivers and much more. administrative jobs are important to most businesses as are customer service focused as they are often one of the first impressions a consumer sees of a business.