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(a)256(b)1000(c) all the command issued since the drawing was first created(d) all commands issued since the drawing was last loaded intothe drawing editor
(d) >>>>>>>>>>>>>>>>>>>>>>>all commands issued since the drawing was last loaded intothe drawing editor
we can undo the All commands till open the drawing so it means the Option- D is the correct answer "all commands issued since the drawing was last loaded in to the drawing editor "
You can undo all the commands issued from the moment you opened the drawing, but if you do that, don't save and open again.......
I agree with the statements above which have chosen option (d)