What security concern arises when a system "may expose internal representation by storing an externally mutable object into" a data structure?
A. It can lead to unauthorized access if the internal data is directly exposed to external modifications.
B. It might cause performance issues due to inefficient data storage methods.
C. It can result in data loss if the external object is deleted.
D. It will enhance the security of the internal data by making it more difficult to access.