Which of the following could not be a valid use of the variables shown? (You may assume that printEmp is a user-defined function.)
a. emp2 = emp1;
b. flag = emp1.id == emp2.id;
c. printEmp (emp1);
d. flag = emp1 == emp2;
e. All of the above are valid.
d. flag = emp1 == emp2;
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