A straight rod of length 9 units slides with its ends A, B always on the X and Y-axis respectively . Then the locus of the centroid of `DeltaOAB` is :

Options

A. `x^2+y^2=3`
B. `x^2+y^2=9`
C. `x^2+y^2=1`
D. `x^2+y^2=81`

Answer

B