API RP 2X Renewal

Hi all,

API RP 2X Certificate is linked to the underlying SNT-TC-1A certificate; so, at the expiration:

1) do I have to repeat the whole examination?
2) do I have to just repeat the practical examinations only?
3) do I have to just renew the underlying SNT-TC-1A Certificate?
4) ??

Thank you very much in advance

Best regards