Final answer:
The best action to take is to wait for the emergency department to provide proper labeling for the second swab.
Step-by-step explanation:
In this scenario, the best action to take is option C) Wait for the emergency department to provide proper labeling for the second swab before processing either.
It is important to maintain patient confidentiality and ensure accurate identification of specimens. In this case, since only one swab has the patient's label, it would be impossible to identify the patient if both swabs were discarded. Therefore, it is necessary to wait for the emergency department to provide proper labeling for the second swab before processing either.