While caring for a patient who has just been admitted with meningococcal meningitis, the RN observes all of the following. Which one requires action by the RN?

a. The bedrails at the head and foot of the bed are both elevated.
b. The patient receives a regular diet from the dietary department.
c. The nursing assistant goes into the patient's room without a mask.
d. The lights in the patient's room are turned off and the blinds are shut.