Q 3000712618.     At the foot of the mountain the elevation of its summit is ` 45 ^{ 0 }`; after ascending `1000 m` towards the mountain up a slope of ` 30 ^{ 0 }` inclination, the elevation is found to be `60 ^{ 0 }`. The height of the mountain is

A

`\frac { \sqrt { 3 } +1 }{ 2 } m`

B

` \frac { \sqrt { 3 } -1 }{ 2 } m`

C

`\frac { \sqrt { 3 } +1 }{ 2\sqrt { 3 } }`

D

None of these

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