Title: Understanding Nginx, iframe, PHP Arrays, GET and POST Methods, and XML in Web Development

2a. 
i. Write a short note on Nginx webserver with emphasis on its architecture. 
ii. What is the use of iframe tag? Give an example. 
iii. Write a short code showing how an array can be declared with PHP. 
2b. 
i. Differentiate between the GET and POST method 
ii. What is XML? 
iii. List 3 features of XML. 
2c. Explain the following HTML tags with all attributes. 
i.     ii.       iii.      iv.      v.