The term "Bell of Arms" was used during the colonial period to refer to a storage facility where the British authorities stored arms and ammunition. This term likely originated from the practice of hanging a bell outside or near the entrance of such a storage room. The purpose of the bell was to serve as a security measure. If unauthorized individuals tried to access the arms and ammunition, the ringing of the bell would alert the authorities to potential theft or tampering.It was a security feature to protect these valuable and sensitive supplies, and the term "Bell of Arms" became associated with such storage facilities during the colonial era.

So, the correct option is [1].