Consider the following figure - Which statement of the following is...

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Consider the following figure
- Which statement of the following is/are correct?
I. Because of line of sight nature of propagation, direct waves get blocked at some point by the curvature of the
- Earth.
II. Because of sky wave nature of propagation, direct waves get blocked at some point by the curvature of the Earth.
III. Because of surface wave nature of propagation, direct waves not blocked at some point by the curvature of the Earth.
(a) Only I
(b) II and III
(c) I and III
(d) I and II
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