Explanation:

German silver or nickel silver is an alloy of chiefly copper, zinc and nickel and is occasionally found to contain trace amounts of tin and lead. It is known for its toughness, hardness and corrosion resistance. From its name, some people mistakenly think that one of its constituents is silver. But it bears that word in its name due to its silver-white color. Note that the term ‘silver’ is now prohibited for alloys that don’t contain the metal. It was discovered in the early 19th century by E.A. Geitner, a German industrial chemist. Hence option 1st is correct.