Regarding stress and fear, why is it important to know about the adrenal cortex and adrenal medulla?

Because the adrenal medulla (the inner-most part of the adrenal gland) is part of the sympathetic nervous system, and releases adrenaline in response to stress.

Because the adrenal cortex (the inner-most part of the adrenal gland) is part of the sympathetic nervous system, and releases cortisol in response to stress.

Because the adrenal medulla (the outer part of the adrenal gland) is part of the HPA axis, and releases adrenaline in response to stress.

Because the adrenal cortex (the outer part of the adrenal gland) is part of the HPA axis, and releases epinephrine in response to stress.