The Average Hourly Wage of Computer Programmers with 2 Years $\mu$

The average hourly wage of computer programmers with 2 years of experience has been $21.80.Because of high demand for computer programmers,it is believed there has been a significant increase in the average wage of computer programmers.To test whether or not there has been an increase,the correct hypotheses to be tested are

A) H₀: $\mu$ < 21.80 H_a: $\mu$ $\ge$ 21.80
B) H₀: $\mu$ = 21.80 H_a: $\mu$ $\neq$ 21.80
C) H₀: $\mu$ > 21.80 H_a: $\mu$ $\le$ 21.80
D) H₀: $\mu$ $\le$ 21.80 H_a: $\mu$ > 21.80