A constant function is a function whose output value f(x) is the same for every input value x, i.e. for all x, f(x)=c.
This means that
- if [tex]x\to \infty[/tex], then [tex]f(x)\to c;[/tex]
- if [tex]x\to -\infty[/tex], then [tex]f(x)\to c.[/tex]
Answer: correct choice is A.
