Which of the following defines a norm on Rn\mathbb{R}^nRn?
∣∣x∣∣=∑∣xi∣||x|| = \sum |x_i|∣∣x∣∣=∑∣xi∣
∣∣x∣∣=max∣xi∣||x|| = \max |x_i|∣∣x∣∣=max∣xi∣
∣∣x∣∣=∑xi2||x|| = \sqrt{\sum x_i^2}∣∣x∣∣=∑xi2
All of the above