Match the following intervals with their names.(2 points)

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Two notes appear on the bass staff in the following order: a D on the third line and a G on the lowest line.
Two B-flats are shown stacked.
Two F notes appear parallel to one another on the fourth line of the bass staff.

1. octave
2. fifth
3. unison

1. octave

2. fifth
3. unison

To match the intervals with their names:

1. The interval between the D on the third line and the G on the lowest line is a fifth.
2. The interval between the stacked B-flats is a unison.
3. The interval between the two parallel F notes on the fourth line of the bass staff is an octave.