1.

Match column A (layers in the ionosphere for sky wave propagation) with column B (their height range) The correct answers is

Answer»

`{:(I,II,III,IV),(a,B,C,d):}`
`{:(I,II,III,IV),(d,c,a,b):}`
`{:(I,II,III,IV),(d,c,b,a):}`
`{:(I,II,III,IV),(c,d,a,b):}`

Answer :B


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