增量提升采用对照组与实验组对比方法。在以下哪种实验中，对照组完全不会受到实验的影响？

All three options—A/B testing, brand lift tests, and conversion lift tests—are experimental designs where a control group is ideally unaffected by the experiment. In A/B testing, the control group receives the original version (A) while the experiment group receives a modified version (B), ensuring the control group is not exposed to the change. Similarly, in brand lift and conversion lift tests, the control group is deliberately withheld from seeing the advertising or campaign being tested, allowing for a clean comparison of the incremental impact on brand metrics or conversions. This isolation of the control group is fundamental to accurately measuring the true incremental lift attributable to the experimental intervention.