Need clarification on how to solve this Q9

Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value to /2, (b) find the critical value Zu/2, or (c) state that neither the normal distribution nor the t distribution applies. 1.6 12 The confidence level is 99%, o is not known, and the normal quantile plot of the 17 salaries 0.8 (in thousands of dollars) of basketball players on a team is as shown. 04 C z score 0- 4200 8400-12600 16800 21000 0.8 2- 6- X Values Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. ta/2= (Round to two decimal places as needed.) O B. Za/2= (Round to two decimal places as needed.) O C. Neither the normal distribution nor the t distribution applies