If the difference between the roots of `x^2+ax+b=0` is same as that of `x^2+bx+a= 0` `a!=b`, then:

If the difference between the roots of `x^2+ax+b=0` is same as that of `x^2+bx+a= 0` `a!=b`, then:
A. `a + b + 4 = 0`
B. `a + b - 4 = 0`
C. `a - b - 4 = 0`
D. `a - b + 4 = 0`

If the difference between the roots of `x^2+ax+b=0` is same as that of `x^2+bx+a= 0` `a!=b`, then:

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