Which of the Following Are Examples of "Objective" Data

Multiple Choice

Which of the following are examples of "objective" data?
1) Laboratory results
2) Observation of a patient's sleep apnea
3) The patient's report of the amount of sputum that he or she produces daily
4) The physician's interpretation of the patient's electrocardiogram (ECG)

A) 1 and 3
B) 2 and 3
C) 1, 2, and 4
D) 2, 3, and 4