A Nurse Enters the Room of a Critically Ill Child

A nurse enters the room of a critically ill child and has a sense that "something" isn't right. After performing an initial physical assessment and finding that the child is stable, the nurse continues to perform a check of all the lines and equipment in the room and finds that the last IV solution hung by the previous nurse was not the correct solution. This nurse was utilising which method of problem solving?

A) Intuition.
B) Judgment.
C) Scientific method.
D) Trial and error.