What is the primary difference between 'open captions' and 'closed captions' in broadcast media?
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A
Open captions are always visible and cannot be turned off; closed captions can be toggled by the viewer
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B
Open captions are only for online video; closed captions are for television
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C
Open captions are provided by the broadcaster; closed captions are user-generated
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D
Open captions include speaker identification; closed captions do not