The Spanish letters 'b' and 'v' are described phonologically as having which allophones?
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A
[b] after a nasal or at word start; [β] fricative elsewhere
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B
[b] always at word start; [v] between vowels
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C
[b] before voiceless consonants; [v] before voiced consonants
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D
[b] in stressed syllables; [v] in unstressed syllables