A silicon monoxide $($n $=1\mathrm{.}45)$ film of $104-$nm thickness is used to coat a glass camera lens $($n $=1\mathrm{.}56).$ What wavelength of light in the visible region $(390$ to $710$ nm$)$ will be most efficiently transmitted by this system? $(1$ nm $=109$ m$)$

a$.$

$422$ nm

b$.$

$664$ nm

c$.$

$713$ nm

d$.$

$603$ nm

e$.$

$483$ nm