Explanation:

- Option 1: Adam's Bridge

- This is a common name for Ram Setu, especially in Western references.

- It refers to the land connection across the Palk Strait.

- Option 2: Setu Banda

- This is another name for Ram Setu, referenced in historical texts.

- "Setu" means bridge, and "Banda" indicates construction, referring to the bridge constructed by Rama’s army.

- Option 3: Nala Banda

- This is NOT a widely recognized name for Ram Setu.

- "Nala" is a figure associated with the construction of the bridge, but "Banda" does not appear as a traditional reference.

- Option 4: Nala Setu

- This name is attributed to Nala, the engineer of the bridge in the epic Ramayana.

- "Setu" means bridge, connecting the name with its traditional reference.

Correct Answer: Option 3 - Nala Banda