A 72-year-old male presents with an increase in the frequency of urination for the past one month. A nephrologist has evaluated him without a conclusive, definitive diagnosis. During this visit, the primary care provider notices fullness and visible pulsation in the neck. Which of the following primary investigation should be ordered?

1.Chest x-ray
2.Electrocardiogram
3.Electrolytes
4.Stress testing

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