Final answer:
Cultural competence is demonstrated by the nurse's ability to effectively communicate in a multicultural context, distinguishing it as the key action indicative of such competence in healthcare.
Step-by-step explanation:
The action by the nurse that indicates cultural competence is 'Communicates effectively in a multicultural context'. Cultural competence in healthcare involves being aware of the cultural differences that may exist between the nurse and the patient and being able to communicate and provide care effectively despite these differences. It requires knowledge, skills, and attitudes that allow nurses to work effectively in cross-cultural situations. While speaking a different language or visiting a foreign country can be beneficial to understanding different cultures, they do not by themselves indicate cultural competence within a professional setting like nursing. The ability to function in a multicultural context is an aspect of cultural competence, but effective communication is the specific action that most clearly demonstrates this competence.