Two electronics technicians are looking at the representations of a silver atom and a copper atom in the figure above. technician a says that silver and copper are both good conductors because their atoms have single electrons in their outermost orbits. technician b says that silver is a better conductor than copper because the silver atom's free electron is farther from its nucleus than the copper atom's free electron is from its nucleus. which of the following statements is correct?

a. neither of the two technicians is correct.
b. both technician a and technician b are correct.
c. only technician b is correct.
d. only technician a is correct.