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When a main program communicates with the object of a class, the first step of the communication involves:

A. a class function using its data members to prepare for the communication B. a signal sent from the main program to a class data member C. the call of a class function from the main program D. the call of a client function from the main program

The ____________________ effect is how rapidly objects appear to recede from or advance toward users for different values of z.

Fill in the blank(s) with the appropriate word(s).