Personalized service:.
A. does not require trained employees.
B. is more consistent than standardized service.
C. increases the consistency of service quality.
D. is based on establishing a set of rules for providing service.
E. depends on the judgment and capability of service providers.

it is a better alternative

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when you sing louad enough the vibration of you voice is able to shatter glass so yes vibration is your answer

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answer; not counted as an offense known to the police;

answer; randomized controlled trials;