When we are upgrading the database to 19c, which networkrelated file do we need to copy from

Question:

When we are upgrading the database to 19c, which networkrelated file do we need to copy from the source database home to the target database home, in case we have the encrypted tablespaces in the source database?

a. tnsnames.ora

b. sqlnet.ora

c. both tnsnames.ora & sqlnet.ora

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