Which built-in allows you to update the screen display to reflect the information that Forms has in its internal representation of the screen? （）

单项选择题Howcanyoumodifytheapplicationtoreturnmoremeaningfulerrormessagestotheuser?（）

A.Create a custom messages table. Include the necessary error handling code in the form modules to display the meaningful custom message instead of the ORA- error message. 
B.Provide users with a form in the application to query the ORA- error, that will return a custom message to replace the ORA- message. 
C.Eliminate constraints where possible, thereby limiting the number of error messages returned. 
D.Create a procedure to include the RETRIEVE_MESSAGE built-in that automatically translates common server errors into meaningful messages for use in Forms.

单项选择题Whenarepeatingtimerexpires,（）.

A.The When-Timer-Expired trigger resets the timer's iteration parameter. 
B.The When-Custom-Item-Event trigger fires and executes the desired actions. 
C.It is put in a queue of expired timers for processing on a first-in-first-out basis. 
D.The When-Timer-Expired trigger fires instantly regardless of any other processing in the form module. 

单项选择题AsanalternativetosettingtheVisiblepropertytoNofortheORDERS_WINDOW,whichbuilt-incouldyouusetoachievethesameresult?（）

A.HIDE_WINDOW 
B.CLOSE_WINDOW 
C.REPLACE_CONTENT_VIEW
D.GET_WINDOW_PROPERTY

单项选择题Whichcanvasbuilt-indisplaythegivencanvasinfrontofanystackedcanvases?（）

A.HIDE_VIEW 
B.SHOW_VIEW 
C.SET_CANVAS_PROPERTY 
D.REPLACE_CONTENT_VIEW

单项选择题YouneedtobaseadatablockontheEMPtable,butyoudonotwanttogivetheusersoftheapplicationaccessprivilegesonthetable.Whichtypeofdatasourcewouldyouusetocreatethedatablock?（）

A.table 
B.transactional trigger 
C.stored procedure 
D.FROM clause query