The Meta Conversions API (CAPI) is a business tool that establishes a direct and reliable connection between an advertiser's server, website platform, or CRM and Meta's servers. This server-to-server connection allows for the sharing of web and offline events. By bypassing browser-based tracking, CAPI helps create a more resilient data connection, which improves ad personalization, performance optimization (such as decreasing Cost Per Action), and the accuracy of measurement, especially in light of increasing browser restrictions and signal loss.

A. This describes the Meta Pixel, which is a snippet of JavaScript code installed directly on a website to track standard and custom events as users interact with the site.

B. This describes the Facebook SDK for Apps. The SDK is a library of tools integrated into a mobile app to track in-app events like installations, logins, and purchases.

C. This is another accurate description of the Meta Pixel, which is a piece of code placed on a website for the purposes of measurement, optimization, and audience creation.

1. Meta Business Help Center, "About Conversions API." This official documentation states, "The Conversions API is a Meta Business Tool that lets you share key web and offline events, or customer actions, directly from your server to Meta's... This helps you improve the performance and measurement of your Meta ad campaigns." This supports the "direct connection to an advertiser's server" and "measure results" aspects of the correct answer.

2. Meta for Developers, "Conversions API > Overview." The documentation describes CAPI as a tool that allows advertisers to "send web events from their servers directly to Facebook." It further explains that these events are "used in measurement, reporting, and optimization," which directly aligns with the functions listed in the correct answer.

3. Meta Business Help Center, "About Meta Pixel." This source clarifies the function of the Pixel, stating, "The Meta Pixel is a snippet of code that you put on your website that allows you to measure the effectiveness of your advertising by understanding the actions people take on your website." This confirms that options A and C describe the Pixel, not the Conversions API.