The Word Application program that Andrew is using highlights grammatically incorrect sentences, and this is what happens “on the fly,” by default, when you make grammar mistakes while typing on Word.
Explanation
“On the fly” in the context of computing, is something that changes automatically while a process that is affected by this change is still ongoing. And in Word application, a mistake that is as a result of grammar or spelling mistakes is often highlighted in the red or green line. This, “on the fly” means that an activity which is highlighting grammatically incorrect sentences is automatically done when needed and upon the Word application identifying a mistake
Options A, C, and options D are activities that should be prompted by the user manually and will not happen until the user had made these changes by themselves.
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