When is the first operation of digital computing was done in Zuse Z3 ?

The Zuse Z3, built by Konrad Zuse, became operational in May 1941. It was the first operational digital computer, though it was electromechanical (using relays) rather than electronic. The Z3 was completed and performed its first calculations in May 1941, making this the correct answer over the February dates and 1942 options.