Identify the equation as separable, linear, exact, or having an integrating factor that is a function of either x or y alone. - 1 (3x +x'y)dx + (xy - 1)dy = 0 Select all that apply. O A. linear O B. separable O C. has an integrating factor p(x) or p(y) not equal to a constant O D. exact E. none of the above

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