The circle for which the points (am^2,2a...

The circle for which the points `(am^2,2am)` and `(a/m^2, (-2a)/m)` are the end points of a diameter istouched for all values of `m` by the line

a)x=a

b)x+a=0

c)x=2a

d)x+2a=0

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