You are developing a Website that is going to be viewed extensively on smartphones and tablets. As you develop your code in an HTML editor, it is very important that you: This task contains the radio buttons and checkboxes for options. The shortcut keys to perform this task are A to H and alt+1 to alt+9.
A

avoid using Application Programming Interfaces (APIs) because most mobile devices do not support HTML5 APIs
B

validate your markup code to HTML5.
C

avoid using CSS because most mobile site visitors will have CSS disabled.
D

write your code for a traditional site, then convert it to a mobile site.