You have several options.
In the first option, you don’t have to cash-out vacation pay upon termination because only time off is promised. The only pay obligation is the promise to pay earned commissions.
The second and third options are different in that time off with pay is in the employment agreement. These are vacation wages, which vests on a daily basis. You are obligated to cash out on termination all unused, accrued vacation.
The third option is potentially troubling because of the payout provisions of Labor Code Section 227.3. What if the outside salesperson is in their second year, is earning more than the first year and is terminated? What does that do to the final rate that is in Labor Code 227.3? You should consult with your labor and employment attorney before going with this option.
Read more about Commissions in the HR Library.