The correct answer is option 2: Swords. The people of the Indus Valley Civilization were not known to have used swords.

Option 1: Daggers. Daggers were known weapons used by the people of the Indus Valley Civilization. They were small, double-edged knives used for close combat and were made from a variety of materials including bronze and copper.

Option 3: Bows & arrows. Bows and arrows were widely used by the people of the Indus Valley Civilization for hunting and warfare. They were made from wood and had flint arrowheads.

Option 4: Spears. Spears were commonly used weapons by the people of the Indus Valley Civilization. They were long sticks with a sharp point at one end made from materials such as wood or bone.

It is important to note that the people of the Indus Valley Civilization had a well-developed system of urban planning, trade, and arts. While swords were not known to them, they still had a range of other weapons at their disposal for various purposes.