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Let ax^(2)+a^(2)x+2=0 be a quadratic equ...

Let `ax^(2)+a^(2)x+2=0` be a quadratic equation, `a in R` and S be the set of values of a for which roots of this equation are imaginary or equal, then answer the following questions:
number of integral values of a in set S is

A

1

B

2

C

3

D

4

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