What are the letter and symbol designations for current?

Current in electrical terminology is represented by the letter "I," which stands for intensity of current. This designation originates from the French word "intensité," reflecting the historical development of electrical science. The symbol "A" is used as the unit of measurement for current, which stands for amperes, named after André-Marie Ampère, a pioneer in the study of electromagnetism. Therefore, this combination of "I" and "A" is the standard way to denote current in its mathematical and practical contexts, making it the correct choice.

The other options present either symbols or letters that do not correlate accurately with the accepted designations for current.