Sales Ltd is trying to enroll brand new devices using Android Enterprise and none of the devices will enroll. Helen, the IT manager, suspects the devices that were procured by a separate department might not have the right API's. What are the right set of API's Helen needs to confirm?

GMS (Google Mobile Services) APIs are the correct answer because Android Enterprise relies on the presence of these APIs for device management functionalities, including enrollment. Without GMS, devices lack the necessary Google Play services and management components to communicate with an EMM (Enterprise Mobility Management) solution. AER (Android Enterprise Recommended) APIs are not a distinct set of APIs but rather a program that certifies devices meeting specific hardware and software requirements for enterprise use. While AER devices will have GMS, AER itself isn't the API set. Treble hardware abstraction layer (HAL) is a low-level architectural change in Android to separate the OS framework from vendor implementations, not directly related to enterprise enrollment APIs. Google Apps is a general term for Google's suite of applications, not the underlying APIs required for enterprise management.