[Solved] The APT requires a benchmark portfolio A)that is equal to the true market portfolio. B)that contains all securities in proportion to their market values. C)that need not be well-diversified. D)that is well-diversified and lies on the SML. Refractory Periods: The period immediately following an action potential during which a neuron is incapable of activating a second action potential, ensuring that signals are sent in only one direction. Gender Typing: A child's development of awareness regarding their gender, leading to the assimilation of behaviors, values, and traits reflective of the gender they identify with. Erotic Plasticity: The degree to which an individual's sex drive and sexual preferences can be influenced by cultural, social, and situational factors. Sexual Dysfunctions: Disorders that prevent an individual from experiencing satisfaction from sexual activity.