What is the LCL for a $3\backslash$sigma c$-$chart if the average number of defects found over $300$ samples is $25?$

Question $5$ options:

$0\mathrm{.}000$

$10\mathrm{.}000$

$-0\mathrm{.}780$

$0\mathrm{.}083$

None of the above