Discussion
Which device preserves memory during battery replacement?
Answer: B
A memory saver plugged into the diagnostic socket or a lighter socket maintains the supply while the battery is out. Connecting a second battery in parallel achieves the same and is genuinely done, which makes the last option a real technique. Naming what changes and what stays the same is the reliable route through questions of this shape. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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