For a given pair of second$-$order system specifications that follow, find the location of the second$-$order pair of poles $[$Re$,$ Im$].$

$\%T_s=8\mathrm{.}4$; $T_p=8\mathrm{.}4$

a$.-0\mathrm{.}476,0\mathrm{.}374$

b$.-0\mathrm{.}417,0\mathrm{.}785$

c$.-0\mathrm{.}357,0\mathrm{.}748$

d$.-0\mathrm{.}595,1\mathrm{.}122$