Adevice called an oscilloscope can be used to demonstrate:
o
a. microphones
o
b. nodeforms.
o c. sound forms
od. waveforms.

It depends on what type of third separates the three notes.for example: if you have two mayor thirds is an "aumented chord"if you have two minor thirds is an "diminued chord"if you have one mayor first and then one minor is a "mayor chord"and inverted is a "minor chord"

B. is the correct answer.