A:how
B:which
C:where
D:that
已知函数f(x)=ex﹣ax﹣a(其中a∈R,e是自然对数的底数,e=2.71828…).
(Ⅰ)当a=e时,求函数f(x)的极值;
(Ⅱ)若f(x)≥0恒成立,求实数a的取值范围.