APFIVE Properties of Exponential Functions
Which of the following exponential functions has a horizontal asymptote at $$y=0$$ as $$x \to -\infty$$ and is an increasing function for all real numbers?
A
$$2^{x}+1$$
B
$$2^{x}$$
C
$$2^{-x}$$
D
$$-2^{x}$$
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