In a three-tier application with a web front-end, application middle tier, and database back-end, where is the best instrumentation point for end-to-end visibility?
A.
It is best to instrument at all tiers for maximum visibility.
B.
It is best to instrument at the web tier, since that is typically the client entry point into the application.
C.
It is best to instrument at the application tier, since it sits between the web and database tiers.
D.
It is best to instrument at the database tier, since it holds the data the client is requesting.
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