84525
Optus is currently rolling out a 3 G network operating on the 2100 " MHz band in cities and most large towns , and the 900 " MHz band in regional areas .
 organization: Optus
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Optus 
Answer:
 organization: Optus