4001
Many of these have not yet selected a format for digital terrestrial broadcasts ( DTTV ) and a few ( Canada , El Salvador , Honduras , Mexico , South Korea and the United States ) have chosen ATSC instead of DVB-T .
 Canada, El Salvador, Honduras, Mexico, South Korea, United States
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Canada, El Salvador, Honduras, Mexico, South Korea, United States