A company is using a mobile device deployment model in which employees use their personal devices for work at their own discretion. Some of the problems the company is encountering include the following:
+There is no standardization.
+Employees ask for reimbursement for their devices.
+Employees do not replace their devices often enough to keep them running efficiently.
+The company does not have enough control over the devices.
Which of the following is a deployment model that would help the company overcome these problems?