If the point (a,(7sqrt3)/3) lies on the ...

If the point `(a,(7sqrt3)/3)` lies on the curve traced by the mid -points of the line segments of the lines `x cos theta+ ysin theta =7, theta in(0,pi/2)` between the co-ordinates axes,then `alpha` is equal to

A

`7`

B

`-7`

C

`-7sqrt3`

D

`7sqrt3`

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