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Let `alpha,beta` be real and z be a complex number. If `z^2+alphaz""+beta=""0` has two distinct roots on the line Re `z""=""1` , then it is necessary that : (1) `b"" in (0,""1)` (2) `b"" in (-1,""0)` (3) `|b|""=""1` (4) `b"" in (1,oo)`

A

`beta in (1, oo)`

B

`beta in (0, 1)`

C

`beta (-1, 0)`

D

`|beta| = 1`

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A
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