Explanation:

- Option 1: Rock cut architecture

Rock cut architecture is not associated with Dholavira. This feature is more relevant to later Indian history, like Buddhist cave temples.

- Option 2: Sea port

While some Indus Valley sites like Lothal served as a port, Dholavira is not specifically noted for this.

- Option 3: Water Conservation

Dholavira is famous for its advanced water conservation and management system. It had large reservoirs and a sophisticated water drainage system, showcasing remarkable engineering skills.

- Option 4: Pottery

Pottery is a common feature across many Indus Valley sites, but it's not a distinct highlight of Dholavira.