Which gland secretes the life-saving hormone?

Deficiency in the activity of the adrenal cortex leads to:

$I.$ The adrenal cortex secretes many hormones called corticoids.
$II.$ Corticoids involved in carbohydrate metabolism are called glucocorticoids.
$III.$ Cortisol is the main glucocorticoid.
$IV.$ Aldosterone is the main mineralocorticoid.
Select the correct combination from the given options.

When an animal is angry and wants to fight,the hormone that is secreted is

Identify the layers of the adrenal cortex from the outside to the inside.

Select the correct option on the basis of the following sentences regarding a gland's functions:
$(I)$ Hormones increase alertness.
$(II)$ Hormones increase the heart beat.
$(III)$ Stimulate the breakdown of glycogen.
$(IV)$ Stimulate the breakdown of lipids and proteins.