I think the answer is 4.
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Answer:
call center/phone/fax.....
Answer:
Diffraction
Explanation:
Diffraction occurs when an electromagnetic waves encounter an obstruction and split in secondary waves, these waves continue the same direction that was split.
These waves going to around the object, obstacle with sharp edges could cause detraction, like tables, refrigerators chairs, walls, furniture, etc.
Crime rate
unemployment
fluctuations
suspension of terrorism