Four rings,each of mass M and radius R a...

Four rings,each of mass M and radius R are rigidly connected (welded) as shown. The total moment of inertia of the system about axis OO' which is lying in plane will be:

A

`3mR^2`

B

`4mR^2`

C

`2mR^2`

D

`8mR^2`

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