Which famous architecture firm's logo was designed to represent the partners' initials while also symbolizing architectural elements with its overlapping shapes?

The visual identity of architecture firms often reflects their design philosophy and approach. The most successful architectural logos combine simplicity with depth of meaning, creating instant recognition while embodying the firm's ethos. This trivia question explores one of the most distinctive and influential logos in modern architecture. Can you identify the correct story behind this iconic design?

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OMA (Office for Metropolitan Architecture) - with overlapping squares representing Rem Koolhaas' approach to urban density
SOM (Skidmore, Owings & Merrill) - with three interlocking circles representing the founding partners and collaborative design process
Herzog & de Meuron - with an ampersand stylized to resemble both a structural beam and flowing fabric
BIG (Bjarke Ingels Group) - with the three letters designed as building blocks that can be reconfigured to represent architectural flexibility