Which of these companies features a stylized world map prominently in their current official logo?

Geography and branding often intersect in fascinating ways! Many companies incorporate geographical elements like maps, globes, or specific locations into their corporate logos to convey global reach, exploration, or connection to place. This trivia question tests your knowledge of how cartographic elements have been used in famous brand identities. Can you identify which company truly uses the described map-based logo?

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AT&T (American Telephone & Telegraph)
National Geographic (the yellow rectangle contains a simplified world map)
United Airlines (globe imagery behind the 'U')
Discovery Channel (globe replaces the 'o' in Discovery)