Quick tips on troubleshooting FSMO roles

Here are some tips on troubleshooting FSMO roles, presented in the form of a pop-quiz. See how you score on it, answers are at the bottom.
1. I can't add a new domain to my forest. Which FSMO role might be down?
2. I tried running adprep /domain but it failed. Which FSMO role might be down?
3. Some users changed their password but now they can't log on. Which FSMO role might be down?
4. The clocks on my servers don't seem to be synchronized properly. Which FSMO role might be down?
5. I tried upgrading a Windows 2000 domain controller to Windows Server 2003 but the DNS application partition wasn't created. Which FSMO role might be down?

ANSWERS:
1. Domain Naming Master  2. Infrastructure Master  3. PDC Emulator  4. PDC Emulator  5. Domain Naming Master