The AppDynamics .NET Agent can instrument both 32-bit and 64-bit processes, as long as they are running on a supported .NET Framework version and operating system. The agent automatically detects the process architecture and loads the appropriate profiler DLL. You can also specify the process architecture manually in the agent configuration file1. The AppDynamics .NET Agent also supports instrumentation of multiple instances of the same application, such as Windows services or standalone applications. You can configure the agent to assign different tier and node names for each instance, based on the process name, process ID, or command line arguments. This allows you to monitor the performance and health of each instance separately2.

The other statements are false because:

A. AppDynamics .NET Agent does support instrumenting processes running multiple App domains. The agent can monitor multiple App domains within a single process, as long as they are running the same .NET Framework version. The agent can also monitor multiple applications within a single App domain, by using the Standalone Applications element in the agent configuration file3.

B. AppDynamics .NET Agent does not automatically discover all the Windows services to be instrumented. The agent automatically instruments IIS applications only. For Windows services or standalone applications, you need to manually configure the agent by editing the agent configuration file and adding the Windows Services or Standalone Applications element. You also need to provide the executable name, tier name, and node name for each service or application4.

D. AppDynamics .NET Agent does not require that the Windows services are running under the “App.pool identity user” account. The agent can instrument Windows services running under any user account, as long as the account has sufficient permissions to load the agent profiler DLL and access the agent configuration and log files. The “App.pool identity user” account is only required for IIS applications that run in an application pool5.

References: .NET Agent Configuration Properties, Configure the .NET Agent for Windows Services and Standalone Applications, Instrument the DefaultDomain for Standalone Applications, Install the .NET Agent for Windows, Administer the .NET Agent