Which of the following statements regarding superconducting materials are correct when a large number of metals become superconducting below a temperature?1) The resistivity ρ of the superconductor is zero.2) The magnetic flux density B vanishes through the substance.3) Ferromagnetic and Antiferromagnetic metals are good examples of superconducting materials.

• A. 1, 2 and 3
• B. 1 and 3 only
• C. 1 and 2 only
• D. 2 and 3 only