please explain the calculation

6. Dustin, who is 48 years old, works for Pinnacle Inc., with a salary of $300,000, a car allowance, and a very nice expense account. Pinnacle is a Fortune 1,000 company that sponsors a defined benefit plan that pays 2 percent times years of participation times the average of the three final years of compensation. In addition, Pinnacle sponsors a 401(k) / profit sharing plan and contributes 18% of employees salary to the profit sharing plan. There is no additional match. If the ADP of the NHCEs is 3%, what is the maximum that Dustin can defer this year (2020)? a. $5,700. b. $14,250. c. $17,100. d. $19,500