Which of the following functions (is) are injective map(s)?

Options

A. `f(x)=|x+1|,``x``in[-1,oo)`
B. `g(x)=x-1/x,``x``in(0,oo)`
C. `h(x)=x^2+4x-5,``x``in(0,oo)`
D. `k(x)=e^x,``x``in[0,oo)`