From "Building a Collaborative Enterprise" by Adler, Heckscher, and Prusak $(2011),$ what is the key characteristic of a collaborative enterprise?

A strict hierarchical structure with clear command chains

A strict hierarchical structure with clear commund chains

A culture that encourages trust, knowledge sharing, and cross$-$functional teamwork

A system where employees work in isolation to avoid conflicts

A business model focused only on short$-$term financial gains