A Soft Drink Filling Machine, When in Perfect Adjustment, Fills $\mu$

Multiple Choice

A soft drink filling machine, when in perfect adjustment, fills the bottles with 12 ounces of soft drink.Any over-filling or under-filling results in the shutdown and readjustment of the machine.To determine whether the machine is properly adjusted, the most appropriate set of hypotheses is

A) H₀: $\mu$ < 12; H_a: $\mu$ $\le$ 12
B) H₀: $\mu$$\le$ 12; H_a: $\mu$ > 12
C) H₀: $\mu$ = 12; H_a: $\mu$ $\neq$ 12
D) H₀: $\mu$ $\neq$ 12; H_a: $\mu$ = 12
E) none of the above