If a chord of circle \( x^{2}+y^{2}-4 x-2 y-c=0 \) is trisected at ...

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If a chord of circle \( x^{2}+y^{2}-4 x-2 y-c=0 \) is trisected at the points \( (1 / 3,1 / 3) \) and \( (8 / 3,8 / 3) \), then
(a) \( \mathrm{c}=10 \)
(b) \( c=15 \)
\( \mathrm{P} \)
(c) \( c=20 \)
(d) \( c=5 \)
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