Which of the following value(s) of \( k \), the equation \[ \left|\...

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Which of the following value(s) of \( k \), the equation
\[
\left|\frac{3 z-1-i}{z+2+i}\right|=k
\]
represents a circle?
(a) 3
(b) 2
(c) 5
(d) \( \pi \)
\( \mathrm{P} \)
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