ANSWERS: 2
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It looks like it's just another note to be played at the same time as the E and G. It couldn't be placed right under the E and G, as in a regular triad, because the E and D would over lap.
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it's a D when the interval between 2 notes is less than a 3rd one note moves to the other side of the stem to avoid overlapping and distinguish between the two notes
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