Q 1450391214.     Find the centre and radius of the following spheres: `vec{r}^{2}-vec{r} . (vec{4i}+vec{2j}-vec{6k})-11=0`

A

`c = (2,1,-3)` and `r = 5` units

B

`c = (2,1,-5)` and `r = 7` units

C

`c=(2,-1,-3)` and `r=3 ` units

D

`c=(2,-1,-3)` and `r=7` units

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