$5.$ A string of length $0\mathrm{.}600$ m is vibrating at $100\mathrm{.}0$ Hz in its second harmonic and producing sound that moves at $\backslash (340\backslash$mathrm$\{$~m$\}/\backslash$mathrm$\{$s$\}\backslash ).$ What is true about the frequency and wavelength of this sound? $($There may be more than one correct choice.$)$

A$.$ The wavelength of the sound is $0\mathrm{.}600$ m $.$

B$.$ The wavelength of the sound is $3\mathrm{.}40$ m $.$

C$.$ The frequency of the sound is $100\mathrm{.}0$ Hz $.$

D$.$ The frequency of the sound is $567$ Hz $.$