If a,b,c are in A.P and a^2,b^2,c^2 are ...

If a,b,c are in A.P and `a^2,b^2,c^2` are in H.P then which is of the following is /are possible ?

a=b=c

2 b=3 a+c

`b^(2)=sqrt((ac//8))`

none of these

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