A student designs an experiment to check whether rats have UV vision. 

Design I: Food is kept in a closed room with only UV light and rat is let in. The rat goes towards the food. 

Design II. A wooden model of predator is kept in closed rooms with only UV light and rat is let in. The rat tries to run away. 

Design III. A female rat is kept in closed room with only UV light and male rat is let in. The male rat chases the female. 

Which of the above experiments can conclusively give information about the rat’s vision in UV spectrum? 

(a) Design I only 

(b) Design II only 

(c) Design I and II only 

(d) Design I, II and III