What does the term 'Dolby B' and 'Dobly C' printed on the tape-recorders and other sound systems refer to? Computer Questions

What does the term 'Dolby B' and 'Dobly C' printed on the tape-recorders and other sound systems refer to?

(a)Frequency modulated system

(b)Amplitude modulated system

(c)Noise reduction circuit Right sign

(d)Both DC and AC power can be used

Details:NA

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