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The technique for hand$-$tracing objects puts public member functions on the front of an index card, and the private data members on the back. Why?

Question $10$ options:

Data members are less important than member functions.

Data members are hidden from outside client code and this simulates the principle of encapsulation.

Member functions as less important than data members.

Member functions are hidden from outside client code and this simulates the principle of encapsulation.