Which among the following is / are correct deference(s) between an artery and a vein?
1. Generally, an artery has thick muscular wall while a vein has thin muscular wall
2. Generally, arteries are located deeper in the body, while veins are closer to the skin
3. Generally, valves are absent in arteries while present in veins
Select the correct option from the codes given below:

Answer: [D] 1, 2 & 3

This question is a part of GKToday's Integrated IAS General Studies Module