Explanation:

- Option 3: Superego: The superego contains the moral and ethical aspects of personality. It's developed through upbringing and social influences. It acts as a moral conscience.

- Option 1: Ego: It operates on the reality principle. It mediates between the id, superego, and reality.

- Option 2: Id: The id is driven by the pleasure principle. It contains primal instincts and desires.

- Option 4: Libido: It's not a part of personality. Rather, it's a concept describing sexual energy or drive.