The construction of the Eiffel Tower began on January 28, 1887. It took two years, two months, and five days to complete, officially opening on March 31, 1889, for the 1889 World's Fair. Initially, it was meant to be a temporary structure, but its popularity ensured its permanence. During World War I, it played a crucial role in radio communication. In 1985, it was added to the UNESCO World Heritage List. Which event happened *before* the Eiffel Tower was used for radio communication?
A) It was added to the UNESCO World Heritage List.