What is the fundamental difference between 'open captions' and 'closed captions'?
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A
Open captions are permanently visible to all viewers; closed captions can be toggled on or off
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B
Open captions are free of charge; closed captions require a subscription
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C
Open captions appear on top of the screen; closed captions appear at the bottom
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D
Open captions are in color; closed captions are in black and white