If ${a^x} = bc,{b^y} = ca,\,{c^z} = ab,$ then $xyz$=
If ${a^x} = bc,{b^y} = ca,\,{c^z} = ab,$ then $xyz$=
- A
$0$
- B
$1$
- C
$x + y + z$
- D
$x + y + z + 2$
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