A concurrent license is ideal for the firm's situation because it allows a set number of copies of the software to be in use at the same time. Since the firm's employees will not be using the software simultaneously, this model provides a cost-effective solution that adheres to legal agreements. A single use license would not work for multiple users, even if used at different times. A group use/site license could be more expensive as it allows for more simultaneous usage than the firm requires. A subscription license might introduce unnecessary recurring fees.