Final answer:
Auto-correct is the feature that changes misspelled words to the correct spelling.
Step-by-step explanation:
In this case, the correct answer would be 4) Auto-correct.
Auto-correct is a feature commonly found in word processors and other applications that automatically corrects misspelled words based on a database of commonly misspelled words.
For example, if you type 'teh' instead of 'the', auto-correct would change it to 'the'.