Ntombi, who runs a non-profit organisation that provides vital veterinary services to impoverished communities, has been given a veterinary ward by a local business man. The ward is furnished with a wide variety of equipment, including a state-of-the-art kennel which uses a computerised locking system to secure animals in their cages overnight. Paul, one of the volunteers, accidently unlocks, instead of locks, the cages as he has not received training on the new system, resulting in all of the animals escaping during the night. Which type of failure has occurred? Select one: a. Facility failure b. Staff failure c. Supplier failure d. Design failure