What amount was Google fined by the European Union over its ad-tech business?

The amount that Google was fined by the European Union over its ad-tech business is significant because it reflects ongoing concerns about market monopolization and anti-competitive practices in the digital advertising sector. This fine is tied to findings by the EU that Google was abusing its dominant market position in advertising technology, specifically relating to its practices around data usage and competition.

The fine of 3.4 billion euros actually represents the EU's efforts to enforce antitrust laws and ensure fair competition within the technology industry. It serves as a warning to other tech giants about the consequences of not adhering to competition laws.

The options provided may reflect various fines from different cases or context; however, 3.4 billion is accurate in the context of this specific inquiry into Google's ad-tech practices.