Which of the following four alterative is not correct? We need modu...

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Which of the following four alterative is not correct?
We need modulation:
\( \mathrm{P} \)
(1) To reduce the time lag between transmission and reception of the information signal
W
(2) To reduce the size of antenna
(3) To reduce the fractional band width, that is the ratio of the signal band width to the centre frequency
(4) To increase the selectivity
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