With respect to an employer's reimbursement of employee business expenses, all of the following are requirements of an accountable plan, except the: a. expenses incurred by the employee must have a business purpose. b. reimbursement of meal and entertainment expenses is limited to 50% of the amount incurred. c.employee must provide accounting to the employer within a reasonable period of time. d.employee must return any excess reimbursement or allowance to the employer within a reasonable operiod of time. please do not guess