Question: When building middleware for distributed systems, what technique can we use to solve the problem of integrating legacy software / interfaces ? Question 1 options:

When building middleware for distributed systems, what technique can we use to solve the problem of integrating legacy software/interfaces?
Question 1 options:
Wrappers or adapters can be used to extend existing components.
Application layering can be used to separate the interface, the processing and the data of the application.
Tuples can be used to structure data.
TCP can be used to establish connection-oriented channels.

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