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Which of the statements A, B, C given bellow are correct? $$\begin{array}{l}\text{A: }{\left(\frac{2x-1}{2-x}\right)}^{\prime }=\frac{5-4x}{(2-x{)}^2},x\ne 2\\ \text{B: }{\left(\frac{{\mathrm{e}}^x-1}{x}\right)}^{\prime }=\frac{{\mathrm{e}}^x(x-1)-1}{x^2},x\ne 0\\ \text{C: }{\left(\frac{\cos x}{1-\sin x}\right)}^{\prime }=\frac{1}{1-\sin x},x\ne \frac{\pi }{2}+2k\pi ,k\in \mathbb{Z}\end{array}$$ The only correct statements are: