If θ is the angle between two vectors $$\overrightarrow{a} and \overrightarrow{b}$$ when is $$\overrightarrow{a} ⋅ \overrightarrow{b} ≥ 0$$

Question

 

If θ is the angle between two vectors $$\overrightarrow{a} and \overrightarrow{b}$$  , then $$\overrightarrow{a} ⋅ \overrightarrow{b} ≥ 0$$ only when 

 

(A) 0 < θ < π/2

(B) 0 ≤ θ ≤ π/2

(C) 0 < θ < π

(D) 0 ≤ θ ≤ π