Final answer:
The valid levels of the ITIL 4 certification scheme are Foundation, Practitioner, Expert, and Master.
Step-by-step explanation:
The question pertains to the valid levels of the ITIL 4 certification scheme. The ITIL 4 certification scheme includes the following levels:
Foundation: This is the entry-level certification that offers a general awareness of the key elements, concepts, and terminology used in the ITIL service lifecycle.
Practitioner: This level helps practitioners to adopt and adapt ITIL guidance to support business objectives, and is not currently available in ITIL 4 but was part of the ITIL v3 scheme.
Expert: The ITIL Expert level was also a part of older ITIL schemes (v3) and denoted a deeper knowledge across several different areas of ITIL.
Master: This level demonstrates a complete mastery of the ITIL framework and its application in the real world.
However, under the ITIL 4 scheme, the structure has changed slightly, and now includes the levels of ITIL Specialist, ITIL Strategist, and ITIL Leader, which all fall under the ITIL Managing Professional and ITIL Strategic Leader designations. Thus, 'Practitioner' and 'Expert' are not part of the ITIL 4 scheme but were valid in the previous version, ITIL v3. Therefore, the correct answers, referring to the ITIL 4 scheme, would be the 'Foundation' and 'Master' levels. We can consider the 'Practitioner' and 'Expert' levels as not valid for the current ITIL 4 scheme.