A publishing company wanted to test whether typing speed differs when using word processor A or word processor B. A random sample of 25 typists was selected and the typing speeds (in words per minute) were recorded for each typist when using word processor A and then when using word processor B. (Which word processor is used first is determined for each secretary by a coin flip).In this case, which of the following is the appropriate set of hypotheses?a. (H0: μ = 0) and (Ha: μ ≠ 0)b. None of the above. This is not a matched pairs situation. c. (H0: μ = 0) and (Ha: μ > 0)d. (H0: μ = 0) and (Ha: μ < 0)