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If a,b,c,d and p are distinct non -zero ...

If a,b,c,d and p are distinct non -zero real numbers such that `:`
`( a^(2) + b^(2) +c^(2))p^(2) - 2 ( ab + bc + cd) p + ( b^(2) + c^(2) + d^(2)) le 0`, then a,b,c,d `:`

A

are in A.P.

B

are in G..

C

are in H.P.

D

satisfy ad =bc

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The correct Answer is:
B
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