What is machine ethics?

Question $18$ options:

Machine ethics can be described as an underdeveloped $$eld of research that has avoided anything concerned with developing ethics for machines, as opposed to developing ethics for humans who use machines.

Machine ethics can be described as an overdeveloped $$eld of research that is has never been concerned with developing ethics for machines, as opposed to developing ethics for humans who use machines.

Machine ethics can be described as an interdisciplinary $$eld of research that is primarily concerned with developing ethics for machines, as opposed to developing ethics for humans who use machines.

Machine ethics can be described as an isolated $$eld of research that is primarily concerned with resolving ethics for machines, as opposed to resolving ethics for humans who use machines.