[" If "f(x)=sgn(x^(2)-ax+1)" has maximum...

[" If "f(x)=sgn(x^(2)-ax+1)" has maximum number of points of discontinuity,then "],[[" (A) a "epsilon(2,oo)," (B) "a in(-oo,-2)," (C) "a in(-2,2)," (D) "a in(0,1)]]

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