In conversion of the implementation phase of the systems development life cycle (sdlc), the old and new systems run simultaneously for a short time to ensure the new system works correctly.
a. phased-in-phased-out
b. parallel
c. pilot
d. plunge

b. parallel

Explanation:

According to my experience on information technology, I can say that based on the information provided within the question the term being mentioned is called Parallel Conversion. Like mentioned in the question this term refers to when two systems run at the same time while transferring operations in order to make sure that everything is running correctly and are outputting the same results.

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i'm so sorry that's not a question and this isn't an answer

(a) oldest