Which of the following has characteristics such as bright lustre, hardness and ability to conduct electricity?

Silver is a metal with all the listed properties: bright metallic luster (reflectivity), hardness (though relatively soft among metals), and excellent electrical conductivity (highest among all elements). Carbon (graphite form conducts but has no luster), Oxygen and Sulphur are non-metals lacking these metallic characteristics. Silver's combination of these properties makes it valuable in jewelry, electronics, and mirrors.