Telstar was the first, non-military satellite launched in 1962. It broke merely after 5 months. What was the cause?

magnetic storm
114
collision with meteor
122
nuclear explosion
105
software flaw
199
In July 1962 USA conducted high altitude nuclear test of antirocket of 1.4 megatonnes of TNT. The explosion conducted at the height of 250 miles destroyed 1/3 of all satellites, including Telstar.
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