Which is probably the most powerful source of self-efficacy?

Question

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Having direct experience with success is considered the most powerful source of self-efficacy because it directly influences an individual's belief in their ability to succeed in specific situations or accomplish a task. This firsthand experience of success strengthens self-confidence and the belief in one's capabilities more effectively than observing others, using relaxation techniques, or managing communication difficulties.

Which Is Probably the Most Powerful Source of Self-Efficacy