Question

SEO is sunset of
(a) search engine optimization
(b) search engine marketing
(c) social media optimization
(d) search engine ​

Answer 1

Explanation:

Search Engine Marketing is over and above SEO but it's only a subset of digital marketing. Digital marketing includes other channels you can use to increase your website's traffic besides SEM and SEO like social media marketing, email marketing, video marketing and content marketing.

Answer 2

Explanation:

Search Engine Optimization

Image result for full form of SEO

Here's my go at it: Search engine optimization (SEO) is the process of optimizing your online content so that a search engine likes to show it as a top result for searches of a certain keyword.