constant function is increasing or decreasing?

Question

a constant function f(x)=2is increasing or decreasing?

Answer 1

Definition:

when x1 < x2 then f(x1) ≤ f(x2)		Increasing
when x1 < x2 then f(x1) < f(x2)		Strictly Increasing

when x1 < x2 then f(x1)  ≥ f(x2)		decreasing
when x1 < x2 then f(x1) >f(x2)		Strictly decreasing

So 

a constant function is increasing and decreasing

but not Strictly Increasing and not Strictly decreasing