Which of the following should can be identified with the trademark law?

A trademark shall protect a sign which may be represented graphically and which is capable of distinguishing the goods or services of one undertaking from those of other undertakings

Trademarks may protect signs such as words, letters, numerals, abbreviations, graphical representations, etc., provided that they are distinctive, including combinations of all the above indicated signs

A seal, a stamp and a hallmark/official marks identifying precious metals, measures, etc. are not considered to be trademarks