Let f be a continuous function satisfying `f '(I n x)=[1` for `0< x<= 1, x` for `x > 1` and `f (0) = 0` then `f(x)` can be defined as

Options

A. `f(x)={(1 , "if"x le 0 ),(1-e^(x), "if" x gt 0 ):}`
B. `f(x)={(1,"if" x le 0 ),(e^(x)-1,"if" x gt 0):}`
C. `f(x)={(x,"if" x lt 0),(e^(x),"if" x gt 0 ):}`
D. `f(x)={(x,"if" x le 0 ),(e^(x)-1,"if" x gt 0):}`

Answer

D