California Alcoholic Beverage Control (ABC) Certification Practice Exam

Driving while impaired is a clear violation of "drinking and driving" laws because it involves operating a motor vehicle with a blood alcohol concentration (BAC) that exceeds the legal limit or being under the influence of alcohol to the extent that it affects one's ability to drive safely. This is a serious offense meant to protect public safety, as operating a vehicle while impaired significantly increases the risk of accidents, injury, and fatalities.

The other choices do not constitute violations of drinking and driving laws. Serving alcohol in a restaurant is a common practice as long as proper regulations are followed. Hosting a drinking party may be seen as promoting social gathering but does not inherently violate laws unless specific issues arise, such as underage drinking or serving intoxicated guests. Having a designated driver is actually a responsible action that aims to prevent drinking and driving, making it a positive practice in promoting safety and awareness regarding alcohol consumption and driving.