High frequency carrier waves are needed for effective transmission ...

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High frequency carrier waves are needed for effective transmission of signals.
I. To reduce the length \( (l) \) of the transmitting antenna as \( l=\lambda / 4 \).

II. To increase the power \( (P) \) radiated by the antenna (as \( P \alpha 1 / \lambda^{2} \) ) so as to increase the range of transmission.
-III. To transmit a large number of signals simultaneously.
(a) I and II
(b) Only I
(c) I and III
(d) All of these
\( \mathrm{P} \)
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