设 min{a,b}={a,a≤bb,a>b\min \{ a,b\} = \left\{ \begin{array}{l} a,a \leq b \\ b,a > b \end{array}\right.min{a,b}={a,a≤bb,a>b ,若函数 f(x)=min{ex−1−x,−x2+2mx−1}f\left( x\right) = \min \left\{ {{\mathrm{e}}^{x - 1} - x, - {x}^{2} + {2mx} - 1}\right\}f(x)=min{ex−1−x,−x2+2mx−1} 有且只有三个零点,则实数 mmm 的取值范围为( )A. (12,+∞)\left( {\frac{1}{2}, + \infty }\right)(21,+∞) B. (34,+∞)\left( {\frac{3}{4}, + \infty }\right)(43,+∞) C. (1,+∞)\left( {1, + \infty }\right)(1,+∞) D. (54,+∞)\left( {\frac{5}{4}, + \infty }\right)(45,+∞)