However, it is hard to see a person can have a sound education and appropriate qualifications a degree

Are the usage of 'for example' correct in the following?
Is example here as 'conjunctive adverb' or 'adverb only'?

However, it is hard to see a person can have a sound education and appropriate qualifications; for example, a degree.

However, it is hard to see a person can have a sound education and appropriate qualifications a degree, for example.

However, it is hard to see a person can have a sound education and appropriate qualifications. For example, a degree.

However, it is hard to see a person can have a sound education and appropriate qualifications, for example, a degree.