386. suppose a, b, c are real numbers such that a?2 +bp2 + c2a2 = k, where k is a constant. then the set of all possible values of abc(a +b+ c) is precisely the

386. Suppose a, b, c are real numbers such that a?2 +bP2 + c2a2 = k, where k is a constant. Then the set of all possible values of abc(a +b+ c) is precisely the Constant. interval (A) -k, k] (B) - (C)-] (D) -k,