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A. when executing system. out. println(a1), the tostring() method in the object class is invoked.
b. when executing system. out. println(a2), the tostring() method in the object class is invoked
c. when executing system. out. println(a1), the tostring() method in the a class is invoked.
d. the program cannot be compiled, because system. out. println(a1) is wrong and it should be replaced by system. out. println(a1.
e. both b and c.

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A. when executing system. out. println(a1), the tostring() method in the object class is invoked.
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