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Which two statements are true about mouse button variables?（）
A:SYSTEM.MOUSE_BUTTON_PRESSED returns a string. 
B:SYSTEM.MOUSE_BUTTON_PRESSED returns a numeric value. 1Z0-132 World Leaders In Certifications Material - Test-king.com 
C:A possible value for SYSTEM.MOUSE_BUTTON_MODIFIERS is Control+Alt+Delete. 
D:SYSTEM.MOUSE_BUTTON_MODIFIERS can only be references in form-level triggers. 
E:SYSTEM.MOUSE_BUTTON_MODIFIERS identifies which special key was pressed in conjunction with the usual mouse button action. 

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出自：Oracle认证

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