What is the formula for the cross sectional area of the secondary conductor of the transformer?

• A. cross sectional area = secondary current * current density
• B. cross sectional area = secondary current + current density
• C. cross sectional area = secondary current / current density
• D. cross sectional area = secondary current ‚Äö√Ñ√∂‚àö√ë‚àö¬® current density