Advanced Patterns — quiz

You have 30 specs that each call `page.locator('#email').fill(...)` and `page.locator('#password').fill(...)`. The IDs change. You're refactoring 30 files. Which pattern would have prevented this?

• Stop using IDs
• Page Object Model: a `LoginPage` class that owns `emailInput`, `passwordInput`, and a `signIn()` method — specs talk to LoginPage, so a selector change is one edit, not 30
• Add comments next to each selector
• Use only XPath