In the medieval period, a munjani was a type of weapon that was used for warfare. The correct answer to the question is option 2, catapult.

A catapult was a type of siege engine that was used to hurl projectiles, such as rocks or spears, at enemy fortifications or troops. It worked on the principle of using tension, torsion, or counterweight to launch the projectiles with great force and distance.

The other options mentioned in the question are as follows:

Option 1, cannon: A cannon is a large, heavy firearm that uses gunpowder to launch projectiles. While cannons were used extensively in later periods, such as the Renaissance, they were not commonly used in the medieval period.

Option 3, gun carriage: A gun carriage is a wheeled platform or carriage used to transport and position artillery pieces, such as cannons. It is not a weapon itself, but rather a means of moving and deploying larger artillery.

Option 4, portable armoury: A portable armoury refers to a collection of weapons and military equipment that can be easily transported. It can include various types of weapons, such as swords, axes, bows, and arrows, but it does not specifically refer to the munjani.