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Solution:Concept: Due to their low resistance and great conductivity, copper and aluminium are most frequently employed as electrical conductors in electrical cables. These metals can be easily formed into wires and do not corrode since they are ductile and have low corrosion resistance.
Sometimes copper alloys are used to increase the copper's hardness, tensile strength, flex endurance, and temperature resistance; however, the conductivity is reduced as a result of the additional alloying components.
Aluminium is commonly available and provides a less expensive option for conductors than copper. Despite being only around 61% as conductive as copper, it is favoured when big cables are needed since it is three times lighter and easier to handle than copper.
Hence, the correct answer is option 1.