Which of the following methods can be used to make permalinks SEO friendly?

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Which of the following methods can be used to make permalinks SEO friendly?
Answers:
1.      Updating the database.
2.      Changing the source code.
3.      Configuring the feature in the config file.

4.      Configuring the feature in the admin settings.
GA
Gaurav Arora, Digital Media Lead. 10+ years running paid media and tracking for brands in the USA, UK and Canada.