Question: How do I tell if a language L3 - L4 is regular and prove my answer by use of the closure properties of regular languages

How do I tell if a language L3 - L4 is regular and prove my answer by use of the closure properties of regular languages and/or the pumping lemma? And how do I do it the other way around: L4 - L3?

Both L3 and L4 are abritrary (but not specified) languages, but L3 is finite and L4 is non-regular.

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