if the complete set of values (s) of 'a'...

if the complete set of values (s) of 'a' for which the function `f (x) =(ax^(3))/(3)+(a+2) x^(2) +(a-1) x+2` possess a negative point of inflection is `(-oo, alpha),uu(beta,oo)" then " |alpha|+|beta|` is :

`a in (-oo , -2) cup ( 0 ,oo)`

`a in (-oo , -3) cup (0 ,oo)`

`a in (-oo , -2) cup (2 , oo)`

`a in (-oo , -1 ) cup (3 , oo)`

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