What Is a Null Hypothesis for a One-Tail Sign Test $\pi$

Multiple Choice

What is a null hypothesis for a one-tail sign test?

A) H₀: $\pi$ = 0
B) H₀: $\pi$ $\le$ 1.00
C) H₀: $\pi$ = 0.50
D) H₀: $\pi$ $\le$ 0.50