Q.

Window class, onEraseBackground/1, de- fines

A. is executed when a visible window is being created
B. is executed when a window is being closed, it is possible to prevent the win- dow from closing
C. when the background of a window must be erased this event is executed
D. when a window must be re-painted this event is executed
Answer» C. when the background of a window must be erased this event is executed
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