If a,b,c,d in R and all the three roots...

If `a,b,c,d in R` and all the three roots of `az^3 + bz^2 + cZ + d=0` have negative real parts, then

A

`ab gt 0`

B

`bc gt 0`

C

`ad gt 0`

D

`bc-ad gt 0`

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The correct Answer is:

A, B, C, D

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