A number divisible by $$12$$ \& $$5$$ is divisible by a product of their factors, such as $$3\times5$$. 
Any number that is divisible by both $$12$$ and $$5$$ must also be divisible by． 
1. $$21$$ 
2. $$15$$ 
3. $$9$$ 
4. $$8$$ 