A nurse working on a medical-surgical unit suspects that several clients have Clostridium Difficile (C-Diff) when they all develop watery diarrhea. Which of the following actions should the nurse plan to take while waiting for the client's lab results?

Place all clients who have manifestations on contact precautions.

Request the providers to initiate antibiotic therapy for every client on the unit.

Perform hand hygiene with an alcohol-based agent.

Obtain stool cultures from all clients on the nursing unit.