Connecting wires are made of substances that have :
(a) highly conducting material
(b) negligible resistance
(c) free electrons in a large number
(d) all of these

(d) all of these

Reason — Connecting wires are typically made of substances, such as copper or aluminum, that possess highly conducting materials, negligible resistance, and a large number of free electrons. These characteristics allow for efficient flow of electric current through the wires.