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If `p ,q ,r` are positive and are in A.P., the roots of quadratic equation `p x^2+q x+r=0` are all real for `|r/p-7|geq4sqrt(3)` b. `|p/r-7|geq4sqrt(3)` c. `a l lpa n dr` d. `nopa n dr`

A

`|r/p-7|ge4sqrt3`

B

`|p/r-7|lt4sqrt3`

C

all p and r

D

no p and r

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