Which Type of Null Hypothesis Is Used in the Figure $H _ { 0 } : \mu \leq k$

Which type of null hypothesis is used in the figure below?

A) $H _ { 0 } : \mu \leq k$
B) $H _ { 0 } : \mu \neq k$
C) $H _ { 0 } : \mu = k$
D) $H _ { 0 } : \mu \geq k$