All of the following are consistent with a diagnosis of acute myocardial infarction EXCEPT Group of answer choices an increased CK-MB at 12h post admission that returns to normal 48h later a normal myoglobin at the time of admission for chest pain, dyspnea, and cyanosis an elevated cTnI 6d after symptoms of angina, dyspnea, and palpitations an LD1 concentration that is higher than the LD2 concentration