Given: The graph of an exponential function.
Required: To find the equation of the asymptote of the exponential function.
Explanation: The exponential function of the type
[tex]y=a(b^x)+c[/tex]
Has the horizontal asymptote at y=c.
From the given graph, we can see that as x tends to negative infinity, the curve tends to
[tex]y=4[/tex]
Final Answer: Option A is correct.
