Which method in the GlideRecord API is used to update a record in the database?

The `gr.update()` method saves any changes made to the current GlideRecord object to the database, effectively updating the corresponding record. It is essential for persisting modifications to existing records within server-side scripts.

`gr.insert()` is used to create a new record in the database, not update an existing one.

`gr.save()` is not a standard GlideRecord method for persisting changes; typically, `insert()` or `update()` are used.

`gr.setValue()` is used to set the value of a specific field on a GlideRecord object, but it does not save the changes to the database.