144. As shown in figure «A» of the illustration, what is true concerning the illustrated frequency response curve

Low frequencies below the cutoff-frequency are attenuated and high frequencies above the cutoff- frequency are passed.
Low frequencies below the cutoff-frequency are passed and high frequencies above the cutoff-frequency are attenuated.
Low frequencies below the cutoff-frequency are passed and high frequencies above the cutoff-frequency are passed.
Low frequencies below the cutoff-frequency are attenuated and high frequencies above the cutoff- frequency are attenuated.

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