Calculate the effective rate of interest for the first year, if the rate of interest is $25\mathrm{.}2\%$ p$.$a$.$ compounded quarterly? $($rounding the answer to $6$ significant decimal figures$)$a$\mathrm{.}0\mathrm{.}281937$b$\mathrm{.}0\mathrm{.}283243$c$\mathrm{.}0\mathrm{.}280660$d$\mathrm{.}0\mathrm{.}276830$e$\mathrm{.}0\mathrm{.}267876$