Which of the Following First-Order Differential Equations Are Exact? Select $(8 y-4 x) y^{\prime}-4 y=0$

Multiple Choice

Which of the following first-order differential equations are exact? Select all that apply.

A) $(8 y-4 x) y^{\prime}-4 y=0$
B) $(2 y-5 x) +(5 y+2 x) y^{\prime}=0$
C) $4 y^{3}+\left(x^{4}+y^{4}-7 x\right) y^{\prime}=0$
D) $\left(7 x-\cos \left(\frac{5}{2} y\right) \right) -\sin \left(\frac{5}{2} y\right) y^{\prime}=0$