Laura has prioritised a list of things to test for their business, PropShop. The goal is to improve the user experience while letting the user accomplish what they want in PropShop's app. Which of the following is a testing tool that Laura can use for PropShop's app?

Firebase A/B Testing is a dedicated tool within the Firebase platform specifically designed for mobile app testing. It allows developers and marketers to run A/B tests on different versions of their app's UI, features, or messaging to understand which variations perform best in terms of user engagement and conversions. This directly aligns with Laura's goal of improving user experience and helping users accomplish tasks within PropShop's app. Google Optimize is primarily for website A/B testing, not mobile apps. Dart is a programming language, not a testing tool. Gerrit is a code review system, not an A/B testing platform.