What does IAB stand for?

The correct choice is "Interactive Advertising Bureau." This organization is a key player in the digital advertising industry, focusing on developing best practices, standards, and guidelines for online advertising. The IAB works with various stakeholders, including marketers, advertisers, and publishers, to support and improve the effectiveness of digital advertising efforts.

This term specifically refers to an organization that plays a critical role in shaping the future of digital advertising, ensuring that the industry evolves in a way that benefits all parties involved. It provides resources, insights, and advocacy for the industry, making it a fundamental entity in the realm of digital marketing and advertising.

The other options do not represent the official name of the organization and may not have the same impact or recognition in the advertising landscape. Each of those alternatives lacks the defining elements that characterize the IAB as a leader in the digital advertising field.