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If m is the A.M. of two distinct real nu...

If m is the A.M. of two distinct real number l and n(l , n `gt` 1) and `G_1 , G_2` and `G_3` are three geometric means between l and n , then `G_1^4 + 2G_2^4 + G_3^4` equals.

A

`4 lm^2n`

B

`4 lmn^2`

C

`4 l^2 m^2 n^2`

D

`4 l^2 mn`

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The correct Answer is:
A
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