Final answer:
Option (B), The optimal solution is to use Windows Autopilot to upgrade work-at-home employees' computers, as it preserves applications, requires minimal intervention, and standardizes the process.
Step-by-step explanation:
The best solution for upgrading computers from Windows 10 Professional to Windows 10 Enterprise for work-at-home employees, while preserving existing applications and minimizing intervention, would be using Windows Autopilot. This tool provides a way for a seamless upgrade and joining of computers to Azure Active Directory (Azure AD), ensuring that existing user data and applications remain intact. Other methods, such as manual upgrade using a USB installer or having employees upgrade their computers independently, could lead to inconsistencies and more hands-on support requirements. Requesting employees to bring their computers to the office would also be less efficient, considering the remote setup of the workforce.