Compare the frequency range of a person$$s voice to the size of the passband in a voice communications channel obtained over the telephone. Which of the following accounts for the difference between the two?

Question $3$ options:

The telephone company uses Gaussian filters to remove frequencies below $300$ Hz and above $3300$ Hz because the primary information of a voice conversation occurs in the passband.

The telephone company uses low$-$pass and high$-$pass filters to remove frequencies below $300$ Hz and above $3300$ Hz because the primary information of a voice conversation occurs in the passband.

The telephone company uses packet filters to remove frequencies below $500$ Hz and above $4400$ Hz because the primary information of a voice conversation occurs in the passband.

The telephone company uses low$-$pass and high$-$pass filters to remove frequencies below $500$ Hz and above $4400$ Hz because the primary information of a voice conversation occurs in the passband.