what changes should be made to the architecture to achieve the goal?

You have been tasked with improving the availability of an existing three tier application.
What is your first stop in evaluating what changes should be made to the architecture to achieve
the goal?

—

A.
Monitor network traffic between tiers.

B.
Separate presentation from business logic.

C.
Identify and document all single points of failure.

D.
Cluster the presentation tier without session replication.