If a small amount of Cu is added to Ni conductor, then%!

• A. Resistivity of Ni will decrease at all temperatures because Cu is a better conductor than Ni
• B. Residual resistivity of Ni at low temperature will increase as Cu atoms act as defect centres
• C. Resistivity of Ni will increase at all temperatures as Cu destroys the periodicity of Ni and acts as defects
• D. Resistivity of Ni remains the same