Final answer:
Since the extraneous part '0a' is to be ignored, the term 427√23 already stands as the simplest form and cannot be simplified any further.
Step-by-step explanation:
The student has presented an expression that appears to be a combination of a radical term and a potential typo or extraneous part. Since the '0a' part does not make sense in this context and should be ignored according to the instructions, we are left with 427√23. This expression cannot be simplified further without additional information or operations, so it is already in its simplest form. The possible answers provided suggest the student may be looking for a combined or simplified term, but as the expression stands, no further simplification can occur.