What is the function of this colossal structure near Chernobyl?

radar
heavy water radiator
protective screen
graduation tower
Duga was a Soviet over-the-horizon radar system used as part of the Soviet anti-ballistic missile early-warning network. The system operated from July 1976 to December 1989. Two operational Duga radars were deployed, one near Chernobyl in the Ukraine and the other in eastern Siberia.
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Answers by country

radar
heavy water radiator
protective screen
graduation tower
answers
flagUkraine
73%
5%
10%
10%
19
flagGermany
63%
6%
20%
10%
49
flagPoland
56%
12%
22%
7%
2666
flagthe United Kingdom
44%
23%
26%
5%
34
flagthe United States
35%
16%
35%
12%
48
flagIndia
29%
40%
14%
14%
27