Nurse A is аssigned tо cаre fоr а patient with diabetes being regulated оn new types of insulin. The patient performs most of her own care and rarely uses the call bell to summon the nurse. The nurse knows this and leaves the patient unobserved most of the shift. Just before change of shift report, the aide reports that she cannot rouse the patient. The patient has entered a vegetative state as the result of brain damage related to severe hypoglycemia. Which, of the four elements needed to prove malpractice are present? (Select all that apply.)