Which type of mobile website version should you use to check if the “user agent HTTP header”? variable is included to identify and provide the relevant web version to the right user agent?

QUESTION Which type of mobile website version should you use to check if the “user agent HTTP header”? variable is included to identify and provide the relevant web version to the right user agent? Responsive web design Independent/standalone mobile site

Fill in the blanks. When you want to use _____, make sure they are placed in plain HTML/X- robots tags. _____ injected by JavaScript are considered less reliable, and the chances are that Google will ignore them.

QUESTION Fill in the blanks. When you want to use _____, make sure they are placed in plain HTML/X- robots tags. _____ injected by JavaScript are considered less reliable, and the chances are that Google will ignore them. rel=amp HTML