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If a line segment AM=a moves in the plan...

If a line segment AM=a moves in the plane XOY remaining parallel to OX so, that the left end point a slides along the circle `x^(2)+y^(2)=a^(2)`, the locus of M is

A

`x^2 + y^2 = 4a^2`

B

`x^2 + y^2 = 2ax`

C

`x^2 + y^2 = 2ay`

D

`x^2 + y^2 - 2ax - 2ay = 0`

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