The length of the a line segment AB is 2...

The length of the a line segment AB is 2 units. It is divided into two parts at the point C such that `AC^(2) = AB xx CB`. What is the length of CB ?

A

`3sqrt(5) cm`

B

`3-sqrt(5) cm`

C

`5sqrt(3) cm`

D

`sqrt(5)-1 cm`

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