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The fundamental theoretical work in data transmission and information theory by Harry Nyquist , Ralph Hartley , Claude Shannon and others during the early 20th century , was done with these applications in mind .
 person: Harry Nyquist; person: Ralph Hartley; person: Claude Shannon
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Harry Nyquist, Ralph Hartley, Claude Shannon 
Answer:
 person: Harry Nyquist; person: Ralph Hartley; person: Claude Shannon