Three identical spheres, each of mass M , are placed at the corners of a right angle triangle

Three identical spheres, each of mass M , are placed at the corners of a right angle triangle with mutually perpendicular sides equal to 2 m (see figure). Taking the point of intersection of the two mutually perpendicular sides as the origin, find the position vector of centre of mass. NEET 2020
A) 2(𝑖 ̂+𝑗 ̂)
B) (𝑖 ̂+𝑗 ̂)
C) 2/3(𝑖 ̂+𝑗 ̂)
D) 4/3(𝑖 ̂+𝑗 ̂)