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Choose the correct statement for in amplitude modulation:

(1) The amplitude of the modulated wave varies according to the massage signal 

(2) The amplitude of the modulating wave varies according to the massage signal

(3) The frequency of the modulated wave varies according to the massage signal 

(4) The frequency of the modulating wave varies according to the massage signal

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(4) The frequency of the modulating wave varies according to the massage signal

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