Depending on what kind of security measures are implemented, D would definitely be a contender. However, B is also something to take into consideration. I would answer D.<span />
Answer:
ENIAC: Electronic Numerical Integrator and Computer.
ABACUS: Abundant Beads, Addition and Calculation Utility System.
EDVAC: Electronic Discrete Variable Automatic Computer
EDSAC: Electronic Delay Storage Automatic Computer
