Explanation/Reference:
A: The services in the Event Report group provide a client application with the reports of events that cause a change in the state of a call, a connection, or a device.
B: The services in the call control group enable a telephony client application to control a call or connection on Communication Manager. Typical uses of these services are:
placing calls from a device

controlling a connection for a single call.

C: The services in the query group allow a client to query device features and static attributes of a Communication Manager device.
E: The services in the routing group allow Communication Manager to request and receive routing instructions for a call from a client application.
References: Avaya Aura® Application Enablement Services TSAPI for Avaya Communication Manager Programmer's Reference Release 6.1, page 128
https://downloads.avaya.com/css/P8/documents/100141354